The veteran people on crypto tend to say that you should keep your coins in your wallet, never on exchages. However if there is a strong downwards movement on a coin and you want to sell to buy latter at a cheaper price it may take quite a bit of time and fees to move it. What is the right strategy?
This is the big problem of centralised exchanges, where you cannot control your portfolio with individual private keys. I think that the best way would be using a decentralised exchange which, although the volumes are a fraction of big exchanges, give you the peace of mind of a safe possession of your coins. A pro: spreads are much greater and trading can be more lucrative!