If you wish to hold some coin then use exchange only for during exchange. Just exchange your coin and transfer on your personal wallet that you have controlled. Specially you can use hardware wallet.
Because many exchange hacked buy hacker. Many people loss their capital by hack.
So please don't hold your coin on exchange for long time.
Yes, keeping your crypto on the exchange for too long is one thing that increases your risk for crypto. Sometimes hackers can hack and execute transactions with them. And maybe the exchange managers can create a plot to take over all the crypto on exchange,