There are a few alternatives in mind for me. Mailbox, posteo, disroot. Disroot is the only one among these with a free email. But posteo and mailbox do have cheap tiers. Posteo doesn’t have support for custom domains last I checked.

That’s just email. I’ve already not been using proton for almost everything else. KeepassXC for passwords, Addy.io for aliases, Syncthing and offline storage across my 3 devices instead of any Drive. VPN I rarely use so free proton is enough for that. Mullvad exists on the off chance I need it for a while (it’s a constant price per month how many ever months you choose, and you can just “top up” with some amount and it will last you the appropriate number of days).