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! 
when the market is decline like this it is very easy to determine a potential altcoin, then how to find them?you can look for it in the coinmarketcap with the following specifications:
1. Dev always innovates on the project
2. Already listing on several major exchanges
3. The movement does not follow the price of bitcoin
4. Despite market decline but the price did not drop dramatically (tends to be stable)