I'll go with ETH and SOL since both of these are my favourite altcoins. Bitcoin always stays at the top though.
FTM and BNB are also some nice coins I have my eye on but for the time being I am waiting for some fiat money to buy them.
I think we can also buy some Decentraland or SAND to stay invested in the metaverse.
Altcoins with their ecosystem, I believe it is an altcoin that will grow, they continue to innovate with many creations that are used by many people including building tokens in it and there are several ecosystem coins that have been added to the portfolio because they know the potential in the future.
But I don't want to be stuck like on Luna coins, there are some that I research for long term investments, but right now I'm more focused on bitcoin and Ethereum.