I was in the exact same boat til recently, but switching off of Proton was actually surprisingly easy even though I had it tied into a bunch of accounts and infrastructure. I actually ended up saving a lot of money compared with Proton Unlimited, and it’s a relief to not have all my eggs in one basket, especially since stuff like Proton’s no logs policy is effectively worthless, and if you’re a whistleblower or similar you’re expected to use a VPN or Tor to access your mail every time to keep from being arrested… but most likely your VPN (and possibly Tor client) is Proton too if you’re paying for it, with the same worthless no logs policy.

some quick recommendations:

Proton Mail

Proton Calendar

tuta does both of these. their mail is e2e and fine — it’s jankier than proton but also less resource-intensive. it’s also the only other choice for now :(

I haven’t used their calendar yet, but from a distance it looks good. I should give it a shot sometime soon.

Proton VPN

this depends on what you’re using your VPN for. actual security? fucked if I know. high bandwidth fuckery? airvpn is pretty good and they’ll let you allocate ports.

Proton Drive

tuta’s getting this soon apparently. otherwise, I can second Backblaze being very reasonably priced if you don’t mind having to choose and set up your own e2e software.