If you’re already moving to Graphene, just use Vanadium as your browser. It ships with GOS and is an excellent privacy choice.

Also, proton mail kinda sucks. I used it for a while but switched to fastmail because an email account with zero interoperability is kinda a lousy used experience.

Edit: same with proton calendar. I like the concept but in practice having a locked away calendar isn’t a great feel.