So I have been out of the loop from cryptocurrencies for a bit now and wanted just a brief introduction about potential altcoins to look at? Thank you! 
Now the potential altcoins are easy to find. You can observe the altcoins in the market that are not very bad. If they can survive in the bear market, then the next time the bull market will have an endless potential.
But the best advice is not to hurry to buy, you have to observe a period of time first.