What I have known about people is that many of them will not listen. Or probably many of them are ignorant and not know the differences between private keys and custodial wallets.
What do you think would be a better approach for crypto traders that are actively trading cryptocurrencies daily?
Best approach I have seen and know is to put any funds not being actively traded in a cold storage. If the positions are spot positions, you fit keep them for cold storage but if it has to do with derivatives (futures, options, etc), then you have to take the additional risks of the possibility for the opportunity to get hacked. What happened to FTX is a good reminder and also a food lesson to learn from.
Optionally, they fit prioritize using DEX and decentralized perps too.