I switched to disroot and am so far super happy with it. especially because it comes with a lot of nice features like file transfer and cloud storage. its also free.

Proton, Tutonota, or Disroot

Proton and Tutanota are both privacy-centric providers who have been around a good amount of time. I'd say both are a good option if you don't want to self-host.

I'm surprised no one's posted about Skiff.

I've been using Fastmail for almost a decade now, and extremely satisfied by the service, privacy, features and price.

If you're interested in signing up for it, I have a referral link (the above one isn't it, I'm not that shady) you can use for a 10% discount on your first year.

Good luck with the search.

fastmail

I really enjoy https://mailbox.org, their custom software can be… esoteric at times, but the company and privacy commitments are top notch, and it has PGP built throughout natively, including an option to automatically PGP encrypt all plaintext emails you receive. I joined it originally as a cheaper alternative to Protonmail but these days I really prefer it.