Trading:
Hold a currency for a short term and sell it once the price rises.
Normally invested person will fix a price target and sell that once it achieves the target.

Investment:
Hold a currency for a long term and sell it after the period or tenure has crossed.
Normally invested person don't bother about the price fluctuation then and there and wait for the fixed time to sell like one or two years or more.

We cannot speculate whether bitcoin price will come down further or rise as most members said. However the price fall and rise is a part of the process of any kind of currency like share market, you cannot have price of currency related things to be fixed forever and that will devalue the currency for investors especially bitcoin. We cannot predict whether bitcoin decline is ended at this time and we need to wait for another two to three weeks watching bitcoins movement.

For bitcoin $20000 mark is not a big task since it met that mark already. Every currency related things will always have a up and down trend but for Bitcoin every one is talking something negative because it is new concept of digital currency. I hope $20000 mark can be crossed in another 6 months maximum and Bitcoin is expected to reach $40000 this year end, this has predicted by experts in cryptocurrency.

There won't be a situation where bitcoin will die, bitcoin will survive for another 1000 years like paper currency for a decade. However, for your question, I would say if bitcoin die all the altcoin will definitely wouldn't survive. Any government or country cannot ban bitcoin alone, instead they will ban the entire crypto currency.

I don't hope bitcoin would dip below $10000 and I could see some improvement for past 24 hours. If it dips below $10000 it would definitely panic everyone in crypto world since all the altcoins also would see a dip in price due to bitcoin's dip. However, the bitcoin team behind the operation will not allow to dip further in coming days to make investors feel safe.

Hope you heard the news that KFC in US is accepting bitcoin for buying their product and Amazon is also planning to accept Bitcoin as the payment option like credit card and PayPal. We can expect bitcoin as payment system in another two or three years, hope this is just an estimation time and things may come near even before that.

Ripple might be one of the crypto currency of the future followed by bitcoin and ethereum. If bitcoin is accepted as the currency for transaction by all the countries ripple also will be accepted like othe crypto currency and there's no doubt in that, but Ripple alone cannot be used as currency making other crypto void.

You can buy any altcoin which has potential, I suggest to buy Ethereum as first priority since this is the next crypto after bitcoin. The next potential altcoin is Bitcoin cash, Litecoin and Ripple. I have personally bought these coins yesterday and as you said the transaction is yet to progress successfully. You choose altcoins as per your budget and as per your research on their potential.

Cryptocurrency volatility always there and it is there for all trading platform. Do not get panic with what others talk about and be calm. After months or a year passed, you meet the same person and tell him what he or she got now with bitcoin. The answer will be amazing and you will be shocked to know the growth of his personal and lifestyle change like a millionaire. Trust me, bitcoin would shoot up to $50000 within this year end.   

Bitcoin is the mother of all coins and if bitcoin is down it is obvious that all other altcoins should be down. The other reason for this is correction and to attract investors more showing the low price in market. Normally this bleeding has happened many times before a sky high pump and this is how the market works on any currency related things in this world.

Have you ever imagined your fiat money to become x10 without doing nothing? If yes, that is the reason for me to choose bitcoin. Bitcoin was at $1000 last February 2017 and now the price of it is $11300 (Even though the price is extremely down) Not only the investment growth, I prefer bitcoin due to its concept like decentralization, peer to peer and block chain technology. Many people have many reason to choose bitcoin but most of them prefer because of the reason quoted by me. 

Hope you are sticking in to a same agent or app for bying bitcoin. Hope there's no special documents or photo required to buy bitcoin in $. There are so many sites available to buy bitcoin with some transaction fees, search for those which have minimal document and buy a one. In my country I can buy bitcoin through exchange from my bank account fiat, try for a one like that if your country exchange has a one.

The concept of cashless society have been introduced by major card members like VISA, MASTER and AMEX long back. However, cashless society through block chain, decentralized and peer to peer was introduced by Bitcoin, due to this the card members are so curious and want to stop the growth of Bitcoin to retain their business. But what will happen is, all the card members will surely adapt block chain technology to continue their business and everything will be through block chain (Digital). It is an advancement where everyone should stick in to it.

Bitcoin price drop is a part of marketing strategy to attract more investors and the price will shoot up again soon, don't panic and don't lose hope. When prices drop it's the best time to buy (simple rule) In crypto currency prices down and up always happen, you cannot expect bitcoin to be in bullish always. However, if it bitcoin falls by $1000 to $2000, it will bounce back higher at least double the lost price (like $4000 to $5000 up price)

If anyone don't like bitcoin, it is because they don't know completely about it. Mostly people believe in fiat, bank and share market still, they are actually not willing to accept the future currency and their lack of knowledge makes them hatred of bitcoin. The best way to handle these people is to just tell them the benefits of it politely and the profit earned by bitcoin investors (People bought bitcoin for $1000 is selling it for $14000).   

Demand and supply with market cap in crypto currency makes a crypto currency expensive if you compare that with paper currency. Bitcoin concept is decentralization, peer to peer and block chain technology, these elements makes bitcoin the top trusted and worth crypto currency till date. You can say or ask in other word, why paper currency is so cheap.

To be specific to your question, crypto currency or bitcoin will never going to be dead for another 1000 years. Suppose if bitcoin is dead we have tons of alt coins which will fill the space, crypto is the future currency and the block chain technology is the advanced platform which banks and financial institutions must take at least 5 years to migrate to block chain technology. Crypto is in well advanced stage I mean, so people must get more interest on crypto in coming days. 

The best ICOs for 2018 is HOQU, VINCHAIN, MATRIX and PolicyPal. These ICOs have good potential and excellent management group, these are promising ICO's as well. Hopefully these ICO coins is yet to release and some have already released, you may invest in their coins to earn a good profit. Just go through their website, white paper and road map, you would understand their promising project details.

I don't think it's risky to invest all your money to bitcoins, however you may invest partial amount of your money in to bitcoin first and watch for the results. If you get the desired profit and feel that the money you have invested is growing and safe in bitcoin, then try investing up to 50% of your money. Until your country legalized bitcoin don't invest all your money in to it. 

Hope most of the members have advised to take up your job offer and do crypto in free time. However there's no specific information provided whether you are trading or mining.

For Trading - You don't need a whole day spending your time for this and you could trade in free time.
For Mining - There's no work involved and you just need to set up equipment's for mining and no manual work involved.

I agree with most of members suggestion that you should take the abroad offer and do crypto business in your free time.