If you are using Firefox, there is an addon that allows you to install websites as apps with isolated settings, cache, cookies and everything with the default Firefox profile (So even if you decide to clear browsing history, your apps will not get affected)

https://github.com/filips123/PWAsForFirefox/wiki/Installing

I originally did but the maintenance burden was killing me. Then last year Proton unified their subscription with VPN and Mail (also upgrading my Proton VPN only subscription to Proton plus) and from there I decided to just go all in on Proton mail. I integrated my domain to Proton mail and never looked back.