That would be a very huge portfolio, but considering someone who already did it on this forum as an experiment with $1000, it seems like something that is paying him a lot after some days. https://buyandhold100crypto.com/buy-and-hold-100-crypto-for-5-years-the-experiment/
I am impressed though that someone had to take the entire step into doing that and monitoring his portfolio with cointracker or so.

Diversification is always a good thing in every investment, while some are doing well, the others may still be stagnant for a while but in the long run, they will still end up doing great.

A lot of alts have increased so huge just in some couple of days even more than bitcoin, but the only shit about them is that they can end up getting dumped as high as they could go which is what makes it a more risky environment than bitcoin.