I don't know why I feel disgusted when I look into layer 0, 1, 2 projects to invest in.
There are too many of them and they have almost same utility, why the need of these excess layer block chain? Now it'd Aptos, Sei is coming, Arbitrum will soon be here, there is also SUI and we have Metis, oh yes I almost forget about Optimism and few others ..
I don't even know which one to go for.
If you are talking about layer 2 solutions for ethereum, then they are similar at first glance, but their protocols differ in security. You need to ask more specific questions or learn the nuances yourself. If you are talking about old Ethereum competitors and new projects such as Aptos, Sei, then the number of projects in your portfolio depends on your risks.