I can suggest you my pickings that seem to be undervalued and also have big growth potential ahead. I have been buying and accumulating vechain, stellar and tron because i think all these 3 alts have the moon potential big time so i will pick these.

Why people keep asking people about undervalued coins, how you determine a coin is undervalued by asking to another person  
Because if another people said a coin is undervalued, its part of their promo and fomo to make their coin rise, IMO you need to research about undervalued coin by yourself to have any good investment...

its hard to find an undervalued coin with huge potential mate
but maybe if you doing your research deeply, you can find what you want, here a good and potential altcoins outside from the TOP 100 coin in cmc
you can learn about Harmony, just and akropolis
regards

At the moment Dogecoin is not the best choice, after years of Dogecoin being the coin abandoned by investors, suddenly the cryptocurrency market was shocked by Dogecoin with a tremendous increase in a price.
according to my analysis, Dogecoin will experience a gradual decline in a price after peaking few days ago.

New topics like this are opened every day. The altcoin rally is attracting many new investors and everyone wants to earn money. Consider the risk you may take when investing.
If you are going to take big risks, you will invest in small cryptocurrencies. I think if you are a new investor, choose common cryptocurrencies such as Ethereum, Tron, NEO 

You can research yourself because I think we do not have the right coin list that can be good to buy. That is because many coins have the same chance to be the potential coins that can increase. If we suggest you take a look at one or more coins, that will not always give you a chance to profit because we have a different reason to buy the coin. But if you want to hold it for a long time, you can buy bitcoin and hold it. The only bitcoin will give you the biggest profit than the altcoin.

Undervalued coins are undervalued because they lack good potentials, can't you see that already? Look at Polkadot and Avalanche that came out in 2020, they are already ranking high, that's what I called good altcoins, I won't leave behind altcoins that are this good for undervalued projects, doesn't make sense

etherum would be a good choice, invest now or later will be a good thing. but if it is now, the risk is if the price goes down then it doesn't go up like the current price. So my advice is, wait for the market to fall even lower then start investing.

i suggest you to buy SafePal $SFP at Binance Exchange, why? SFP has the largest record with the highest allocation in IEOs on Binance, and so many reason that you must have some SFP like their new Feature is'nt released yet (Staking, Earn SFP, and more)

If you are looking for popular tokens that are cheap and can make a good impact when the market is bullish, then the best choices are Tron, Dogecoin, Stellar, and Cardano, these are cheap tokens that always have a very good trading volume in the market.

There are many projects in the market that can give us a great profit in the future. As we all know the market is bullish at the moment, And many investors have benefited. But still we have time and you too can get very good profit from it. At present, many such projects are registered on Binance smart chain that can give good good profit. I think there are some projects that can give us some good profits going forward But before investing in any project, you must know about it yourself

Backryswap
Cake
Poolz
Dego
Juld

Since you already have good coins, I suggest a new project probably started since last year and early this year.
DIA, POOLZ and CTSI has a great potential as of right now, and they managed to hit their new ATH at least for Poolz and CTSI. These are just my suggestions and you still need to do your own research before buying because its too risky to depend to anyone, so to prove that his is a good altcoin to buy please do your part.

Can you take a look at the new projects like UNILEND, FLOW, AVAX, Enjin?
I do believe if these projects have a lot of potential to grow in the future. There will be a lot of legit icos will be coming soon just like sovryn, plasm, hopr and many more. These icos have backed by some big VCs.
I think that there's a lot of legit coins below top 50 CMC.
Those were my choices but you should always DYOR before try to consider about that dude.

You can trace the altcoin market using one of the popular price tracking site to located and discover the alt that will be profitable in the future, because if you base your decisions on the opinion of user's you may be easily mislead.

Since you already have good coins, I suggest a new project probably started since last year and early this year.
DIA, POOLZ and CTSI has a great potential as of right now, and they managed to hit their new ATH at least for Poolz and CTSI. These are just my suggestions and you still need to do your own research before buying because its too risky to depend to anyone, so to prove that his is a good altcoin to buy please do your part.

To have an idea, go to the losers. If you are not yet good with those good altcoins that you have then, you can have an idea for these type of gainers and losers for the day/week.

https://coinmarketcap.com/gainers-losers/

PS: DYOR.

For me it's not so much about what's ahead but what's transpired quietly. Like they actually own a patent https://dragonchain.com/blog/dragonchain-awarded-us-interchain-patent - they have a successful business model already.

Users can also earn more Dragonchain by running unmanaged nodes. If you have your $DRGN in your wallet, you can check your TIME here https://dragonchain.com/community/time/ If you have a lot of TIME you may be missing out on setting up a profitable node.

Currently my most recommended alt to friends, family is $DRGN https://www.coingecko.com/en/coins/dragonchain I believe for what its doing and the road ahead its quite undervalued.

I won't go spending a ton of time on why I think it is as I believe everyone should do their own research but look at their twitter for some recent news too.

Good luck!