ADA or SOL, BNB are all young with ETH, who can replace ETH in the next 5 to 10 years, we won't know but 1 or 2 years I don't think I can find an altcoin to topple ETH. Although the ETH gas fee has not improved yet, the projects that still exist and develop on the ETH network are still very crowded.
If you are looking for altcoins for long term investment then they are not a bad choice. In addition, you can consider Near, Matic is also worth the investment.
Giving just tips are very easy but for me, we need some basic information from OP for this all is better because we have no idea what is going on and what is his strategy because every one is going with his own strategy and specially budget which is very important. If he wanted to go for some long time then he needed to go with very strong community coins because it's better choice. And if he wants to do for some short term than he needs to check few things like which coins are performing in daily basis and weekly basis it's very important for him.
For me, it's better he does some good search by himself and then invest his funds because this is very good way for having good profit and better use case.