I use their OAuth whenever I can, all my accounts on the internet use the gmail address, most of my life is in gmail.
Losing emails is not a bug deal, I can back them up, but losing Oauth accounts and ability to reset passwords for accounts I don't have a password saved in my manager is a bigger concern.
Does anyone have any suggestions?
My suggestion would be to get your own domain, get an email service that supports wildcard email addresses, and get a password manager. Start migrating your accounts one by one, until you no longer depend on your gmail account for OAuth.
It will be tedious, but for most websites you can update your email address in under a minute. Put a movie on and knock them out in an afternoon.
never use an android device
There's seriously got to be a better way. I want to get a Pine Phone but they don't sell them with service where I live yet..
Make sure you back up the stock rom first, you might need it later.