I think it reasonable to invest in the top 10-15 alts.
However, I have some doubts about the ETH. What if BNB completely replaces it?
And all the projects and iCO in the future will be on the BNB, and the ETH will gradually die?
It wont! Ethereum has a huge marketcaps and a large number of investors, even though Ethereum will lose popularity from the BNB though it will not make Ethereum die, ETH will survive and remain alive, so dont be afraid dude.
ETH will never be died if crypto can stay alive. It has huge popularity and also it is being used by a lot of erc20 base token. So, they will never died and I think they will get more popularity.