I've cancelled my subscription yesterday, conveniently it was about to renew at the end of the week, so I have a few days to migrate from Proton, here's what I'm thinking of, but I'd love to hear what other people are switching to
Hide-my-emails keep working after you leave proton if you have your own domain. I left proton last year and the alias I created there still point to my email address. But you have to have it point to a custom domain email address