So, I think this is a decent diverse allocation of crypto for a portfolio:
Proof of Work coins:
BTC (must be largest part of your portfolio ~ like 80%-85%+)
LTC
XMR
Staking coins:
SOL
ETH
PolkaDot
USDC
Just in case coins:
XRP
DOGE
BTC has to be the largest part of your portfolio though.