Some countries prohibit Bitcoin ownership and transactions due to its fluctuating value, a list of countries that accept Bitcoin can be found here wikipedia

I have seen several countries ban Bitcoin because Bitcoin cannot be controlled by one country, as I know, corruptors who have high positions in every country will do anything for it, but I believe that Bitcoin will replace USD and fiat currencies others because Bitcoin is very transparent and no one can manipulate every transaction

You put multiple choices in one option, i think you can differentiate long term and short term investment, if you have an altcoin like Ethereum then do spot trade and the profit you have you can put into usdt/stablecoin,after that use the DeFi platform to profit from farming stablecoins of your choice, choosing several portfolios for investment requires patience, and make sure you choose long-term investments if you want to get a lot of profit, I'm not giving you advice, but you can see a graph of each coins on coinmarketcup.

Lots of positive information, I've seen some good information from every country and I hope it doesn't become a discourse, but it can be proven by good actions and good regulations like El-Savador has done.
Bitcoin ETFs determine the acceptance of Bitcoin in the stock market and if it is approved, many countries will compete to own Bitcoin

as usual, the crypto market is in a bullrun phase as it nears the end of the year, but no one knows if altcoins will provide many surprises such as price increases when Bitcoin prices start to fall, current price increases due to Bitcoin prices and new investors starting to trade, season the heat is always positive in the crypto space, you can see every yearly chart at CMC and the situation keeps happening every year.

Hodl, I will not regret if I do an analysis of every coin I have chosen, some alcoins and almost all coins have different prices, therefore the risk needs to be studied before choosing to invest.
Bitcoin and the other top 100 altcoins are great for trading, but have you ever thought the price of Doge is going up like it is now, hype can change everything and when you have a top coin then you have nothing to worry about because they have a large market cap.

Bitcoin is a great choice for a long term investment option, but stay DYOR and use your skills to trade.
New altcoins that have gaming platforms, NFT, DeFi are good for investment, but don't invest all your money in 1 portfolio, make sure you have more than 2 portfolios and don't use all your money to invest in crypto because crypto prices are very volatile

At first I got to know NFT from cryptokitties games and Knight story games, there I had some cute game characters and I can't believe the current price is so expensive, there are a lot of games nowadays that do something like that game, and some games like Axie have earned it. lots of support from users with large crypto market caps, the NFT trend will continue and we will see a lot of game console users getting into crypto and they can sell all the game characters they buy at the price they want

Have you ever read the Bitcoin Whitepaper, here you can see some translations of the Bitcoin Whitepaper
https://bitcoin.org/en/bitcoin-paper
You can use Bitcoins for investment and payments, if you don't have Bitcoins, that's fine, because all the choices are yours and as I know, if bitcoins aren't created, then you can't see stable coins and altcoins.

Both are stable coins and you can use them without worry, stable coins on cryptocurrency will have the same price as usd.
Usdt and Busd for me are good to keep some advantage because both tokens support blockchain with cross chain tokens, because both have good volume in crypto market and usdt is at 3 cmc.

I think there is no need for rules to develop new projects, with new altcoins, but monitoring needs to be done for this and laws need to be owned by each country for cryptocurrencies in order to be able to crack down on some fraudulent projects because this aims to avoid scams that can harm investors, as I know, some new ICO in 2017- 2018 ended in scams, like Bitpaction Exchange and many other things.

Cryptocurrencies have transparency data and I think it's a good technology for now, the government can't make any special rules about licensing crypto projects, because some countries have copied Sathosi's idea without needing permission from anyone.

No one knows when the bear market situation will end, but now we have seen an increase in the crypto marketcap and some new investors seem to have started buying more coins for them to store and trade before Bullrun come again.
I'm a Hodler and the market situation doesn't matter to me  because everyone has a goal if they invest and therefore I will sell Bitcoin and other altcoins when approaching Bitcoin Halving, because it will definitely affect the amount of demand and the price will increase

Bitcoin is known for its high price in cryptocurrency market, but altcoin is another option to invest, who knows the price of BTC will reach $5k, $10k, $20k, up to $60k.
all because of the existing technology, namely Blockchain, without Bitcoin, we will not see the idea of Ethereum, DeFi and NFT as it is today. because all of those ideas started with Bitcoin.

Actually it is not easy to choose a good project, but I will look at the smart contract and whether TVL will be locked for a long time and other thing is SAFU, some investors in the BSC network use this system to increase new investor confidence but there is no guarantee of profit in investing because we do not know what the developers will do in the future and stay DYOR mate 

as @Almasani suggested to you, if you still keep the Phrase / privet key, there is nothing to worry about it, but make sure you download the metamask according to the link provided and use another wallet then import the phrase, make sure you look at the blockchain explorer for see your coins, if you are afraid of losing the coins in the wallet address then move it to another wallet like Trust wallet, Safepal and other wallet u need.

Nothing sure, 2 to 5 years is a long time but if you choose a coin like BTC then there is nothing to wait for, because the price will definitely go up with limited supply.
New altcoins will be an option but there is no time to hold coins for a long time if the coin does not have good fundamentals, tokenomic needs to be evaluated before investing and take time to see the market situation, because every information is very necessary in making decisions to sell or buy.

I got 0.8 ETH from Bounty in 2019 and I kept it on exchange for 2 years, surprising thing happened when ETH price in early 2021 was above $3k and I am still holding ETH for long term, from here I can learn to hold Altcoins and choose Hodl to get a big profit, no one knows the price of a particular stock or coin will go up or down, but all options will pay off and don't panic when investing because it can cost you money.

Looks like the OP hasn't been active on this forum for a long time, but some good investments for the next 5 years are Bitcoin and ETH even though there are some new projects in the crypto space like DeFi and NFT platforms, some altcoins will still follow BTC price movements, I've been holding coins Waves for 1 year and have made good profits, I think always believe that your choice will be a good thing because there will be no regrets because it was your choice

Hype, It seems that altcoins will provide many ideas and developments in crypto technology in the future.
Good projects have clear goals and the team is working well according to the roadmap, but some new projects nowadays are difficult to research because some projects have anonymous teams but the price of the coin is rising with a good market cap, research before investing and look for it projects that have real products, then we can choose some new portfolios for investment, don't invest all your money in crypto because there is no guarantee for profit if you don't have experience and patience.

I don't think Bitcoin price will go to the $20k, because if you look at the 200MA support, the price will drop to the $27k support in july, Bitcoin price currently strengthening since summer is in august, there are a lot of expectations for the price to rise above $40k and it will take a little bit of patience to wait for that to happen as new investors are likely to buy more bitcoins before the end of 2021

I think the popularity of Ethereum is not diminishing because we are still seeing ETH market cap at 2nd position coinmarketcup and I agree with you if ethereum will continue to exist, some new projects on the ethereum network are being developed and I think when the fork happened, the users who were using yesterday other blockchain networks will return to ethereum as transaction fees are currently back to normal