I have 2 here that I like best, there are lots of others but these are what I consider long holds

The first is perhaps more of an outsider but with better potential gains (in the 1 year timeframe anyway)
HTML coin https://htmlcoin.com/
Currently around 25-30 Satoshi or about $0.003
Very possible this is a top 25 coin - DYOR so that would mean around $0.25 in a year or x75 from here.

The second is likely to be top 3 in my opinion
ADA - Cardano Foundation's coin https://cardanofoundation.org/project/#the-cardano-foundation
A very ambitious project and another long roadmap. Research based philosophy and a potential big platform down the road.
Currently $0.50 but peaked over $1 recently. Top 3 would make it around $5-10 next year so x6-x20 from current price.