Buy a domain (I bought lastname.contact) and subscribe to Fastmail or a similar paid-for service. You can then use anything@lastname.contact and if your email service provider drops you, you can switch to another and not care about your contacts trying to reach you or updating the email address of all your online accounts. I couldn't be happier with the switch (I was using Protonmail before, and Gmail a long time ago…
I am curious: What made you switch from Protonmail to Fastmail?