I just want to thank everyone for all of your input so far. I still haven't decided yet how I want to store my seed phrase. I bought two Ledger Nano X's but my crypto is still on an exchange. I know that, "If it's not your key, it's not your Bitcoin". Still, I feel safe with it so far because the exchange is insured for up to $250,000. I know. I am being stupid by putting trust in an exchange.
IMHO, the only way to justify the storing on exchange is to trade there and receive profit that equals iterative covering of the pertaining risk, but even in that case I would repeatedly withdraw part of the gained fund to my own wallet.