Honestly, bring on the down votes but Proton is a massive, massive improvement over google. Bring your own domain into it and then you can switch providers at a later time hassle free if they do something annoying enough to warrant the switch.
Ive seen the hate, I agree; fuck the CEO, but compared to google it is wildly the better the better choice
https://proton.me/support/custom-domain You buy a domain, use that for your proton email address with the above, then if you switch to something else thats not proton, yoymu just deregister it and bring it with you to the next one. No changing logins, no changing email addresses with everything. Just a smooth port.