According to me, Solana, Ethereum, and Cardano are three coins whose prices are well known to climb. Those who have committed in these two will make more, while those who haven't should prefer these three coins. First and foremost, their funds will be diversified, and they will also make a sizable profit since these three are optimistic about the future.
I will choose like you, these are the 3 best altcoins in my opinion. ETH and ADA are sure to have strong developments in the future, and Sol is a blockchain with huge potential, as long as it fixes a few problems, it will be the fastest and cheapest blockchain today. All 3 are well worth the investment as well as using them. If OP adds BNB to the list above, then BNB will also be my pick, BNB is as good as ETH.