it's a process. by now you're probably using at least one for doing 2 factor authorization with the other. to migrate you have to create a 3rd and go through all your accounts authorizing a login then changing the 2fa account.

I'd say it's probably easier if you have a password manager app, then you can at least let it autofill login info and use it like a checklist to work your way through. Those are obviously their own kind of baggage though