It's not recommended to save all your money on exchange for long period of time, if you could you can buy hardware wallet. I personally don't know about most of the altcoin that you mention, TRX and EOS are good investment i think. but i will not suggest you to hold many altcoin. instead if i were you i will sell all those coin and buy some ETH,TRX and BNB or buy more BTC.
That's very wise advice. Storing assets in an exchange wallet are very risky, moreover, hackers will definitely make it a target. Some time ago there was a hacking case on Kucoin, hopefully, this can be a lesson for us to choose a true professional and responsible exchange if there is a hack like that. Well, it would be better if you use a personal wallet such as a hardware wallet, the security is better.
If you want to invest in an exchange, yield farming is now popular, and one of the highlights related to Binance is pancakes, just give it a try. DWYOR