The second is likely to be top 3 in my opinion
ADA - Cardano Foundation's coin
https://cardanofoundation.org/project/#the-cardano-foundationA 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.
Yes, Cardano project is a very ambitious and good one. But for long term investment I think it's not good because its supply is really too high (31,112,483,745 ADA). No coin with a such supply could ever reach a high price.