It is difficult to say which ones will be the best performers. Likely some smaller coins that will get pumped at some point. But these are very difficult to pick right and there is a big chance to lose out big time.

Coins that will perform well with comparatively low risk are the established Altcoins such as, for example
-Monero
-ADA
-Ethereum

If you want to have a few that have even more upwards potential due to lower market cap, look into established coins such as, for example
-VeChain
-IOTA
-Siacoin
-BAT