The only passive income that I know you can do with altcoins is through staking, farming, trading or copy trading, if you are going to do staking, the best platform I can recommend to you is the Binance platform, if on Dex you want to stake is biswap for me he is okay.
I think most people do prefer to stake on platforms like Binance. Because they're easy and popular but, the cons there is that you don't hold your fund. By that means, is that there's no private key that you're holding for your funds unlike those that are in the DEX.
Farming biswap is also okay for me, and as for copy trading, I recommend Fairdesk and Bitget, they are quite legit and their features are good too. But this is just my suggestion.It is still Do it at your own risk anyway.
As long as you're earning passively on the platforms you prefer, they're really good. Speaking of this copy trading, I've known this but with those exchanges you've mentioned, is it like that they're the one doing the trade for you and you just leave it there? or you still need to manually control your copy trades?