Comment by AnonC

The closest would be having your own domain that’s linked to an email service provider (like mailbox.org or Google Workspace or several others). But to your point of switching email providers being daunting, first buy your own domain and then use that domain with an email provider of your choice. Then start chipping away at the emails you receive in your Gmail account and switch each of those senders to your new domain (and a new email address there). Do it a few at a time, give yourself a whole year to complete it and get going.

It’s even easier if you list out the most important senders in a checklist and move those first. But give yourself at least a few months time. It’s certainly possible.

Once you have your own domain, future migrations to another email provider would be a matter of moving the emails and updating DNS.