It depends on your investment purpose, coin criteria, risk management and other aspect. If you just want to safe investment you can choose top 50 coins in coinmarketcap.
But if you want to support coin with clear roadmap and project it self, and hope coins will give higher return for you maybe this coins suitable for you
Zil
Tron
Btt
Cardano
Polygon
Solana
Good choice with Tron, Solana, Cardano, and Polygon as these 4 have shown good returns this year. I am not sure about BTT and ZIL, BTT has quite a large supply which does not look good. The large supply restricts its price from going up whereas Zil has not been open with its supply but its circulating supply is again the reason this coin might not see a good price hike. You can argue about Tron in the same way but its utility is the reason why its price has been rising.