I use Migadu with my own domain

Protonmail

Tuta is pretty good and secure but not as fully featured as other providers. For example, there is no way to bridge your email to the client of your choice last time I checked. Still, their client is pretty good. Guess it depends on your needs.

Buying your own domain.
You can then use whatever provider, or host your email service… but at least you don’t need to change addresses when switching anymore.

disroot and autistici have been providing decentralised communication services (like email) free of cost for many years. They are both run by activists and survive on donations, and they don’t spy on you or get any money from your data. Also they run freedom-respecting software, so all their code is publicly auditable.

Murena mail, Nextcloud mail, Tuta, Proton, aything is better as GMail, only Hotmail is worse.