What did you move to? I'm moving away from Google and considering alternatives, but Fastmail seems to be the most "reputable" and it's hard to know who to trust.
You might want ProtonMail or Tutanota if you wish, but having it accessible over my Mobile app of choice was a blocker for me.
Some of the extra credits that made me choose Migadu:
* Their site works without JavaScript enabled
* Very simple and lightweight
* Strong support for standards and portability
* Open Source (as in FOSS) Stack, including their UI. https://git.sr.ht/~migadu/
* They're not after investors or scaling: https://www.migadu.com/procon/