Some are easier than others. Especially if you don’t mind paying. Protonmail, calendar, drive solve some big ones right away. Maps is tough though, I’ve tried to find a better solution and haven’t been able to so far.
You can’t transfer the desktop App at all. But you can transfer your phone easy enough. Just go to account, scroll down and choose transfer account
Some are easier than others. Especially if you don’t mind paying. Protonmail, calendar, drive solve some big ones right away. Maps is tough though, I’ve tried to find a better solution and haven’t been able to so far.