Earlier quoted context omitted.
Use a custom domain and don't use google for email. And if you do use your gmail address just forward it and start to transition to something else. With time everything of importance has been transferred.
How do you even pull away from a Gmail address? I'm nearly twenty years into that service. Getting banned would be absolutely devastating...
create icloud account.
use their custom domain email setup (free btw) - https://support.apple.com/en-us/102540
Start replacing important account emails with your custom domain.
Every time you get an important email in gmail, login and update.
Bonus: icloud let's you create catch all emails, so you can create many burner emails such as hackernews@mydomain.com