[cube00]

Get your own domain so you can easily change providers in the future. Start with your password manager and change the address on all the accounts you have in there.

After a few years you'll notice you stop bothering to check your Gmail and you can delete it to close the address.

If you need motivation, skim the /r/GMail subreddit and see how many people are getting locked out daily.

[8cvor6j844qw_d6]

Do you have a recommendation for a major email provider as a fallback if you have to pick one?

I vaguely recall encountering a service that only accepted addresses from a whitelist of big providers (Gmail, Yahoo, Outlook, etc.), even @icloud did not qualify.

[JoshTriplett]

That's a service that doesn't want your business. If you care, message them about it

I've never once run into a service with such a restriction, but I can imagine someone being that short-sighted. I have seen services that only support "log in with Google or Facebook", which is comparably terrible.