Seconding mailbox. It's a nice no bullshit provider so far.
E2E encryption is a bit of a distraction on email. You're not emailing people on the same provider most of the time, and if you actually need privacy just use a purpose built communication system. With that in mind, it just comes down to something that is in a jurisdiction that you're ok with, and has values you care about.
While you're at it I recommend getting a custom domain if you haven't. It's not much extra work, and will make it easier to switch in the future.