Your bitcoins should only be stored in cold storage wallets after purchase, and transferred out when you want to sell them. It takes less than 10 minutes. Remember, if you don't have the keys, it's not your coins.
I also believe that the current events with exchanges will be a lesson and same way sound a warning to everyone using centralized exchanges to take oft their life earnings and assets off from them in other not to be a victim just as in the case of FTX , we don't know which other exchange will be the next very soon because we are in the peak of market volatility and this has proof to be one of the means whereby some exchanges were exposed or being casted.