I'm gearing up to do the same soon. There is an encrypted email service I'm switching to (proton mail). I used it before, but hadn't fully bought into the off-grid stuff. I plan to delete my google account over the next year, and switch everything there. It's hard to untangle everything, but I've had my google account compromised a few times before, so it's time for it to go.
I know others have recommended Proton, but if you need something with standardized calendar/contacts support, I recommend Fastmail. Not quite as secure, but still infinitely better than letting Big G scrape your inbox.
Not the OP, but I have been using ProtonMail as my personal mail for a long time and it works really well for me.