I always make sure to memorize my mnemonic phrase whenever I create a new wallet. I will repeat the words everyday until they are stuck in my head. If something catastrophic were to happen and all my possessions were to be destroyed I would not lose access to my Bitcoin as long as I don't forget the backup phrase.
That's one of the reasons i am keeping mine in exchanges. Better security and better backups than i could ever provide. Yeah, sure they get hacked and cexes are against an ideological ethos in here, but frankly i don't care. I am not doing anything illegal so my coins won't be confiscated by any government, i have an instant liquidity ready and don't have to worry losing my private keys. Funny enough, i already lost one paper sheet with all my old account private keys in it. Maybe that lucky finder will get some airdrops later on.
My Coinbase account was the first wallet that I used. After a while my PC stopped working and I didn't have access to my account for some time. I felt my coins would be safe when I recovered my account. I did eventually regain access but Coinbase had started implementing mandatory KYC and if I had waited a few more months I wouldn't be able to withdraw my funds because I signed up using an alias and it would be impossible to pass KYC. After that I never trusted centralized services. We have also seen what happened with FTX and Celsius. The only way you can ensure the safety of your money is through self custody.