You could replace Mega, Bitwarden, Tuta, and Gmail with the Proton suite for simplicity (Bitwarden and Tuta remain great options). Besides Drive, Pass, and email aliases, you’ll get a trustworthy VPN and Calendar. A Linux app for Proton Drive doesn’t exist yet, but it’s in the works.
If you want to look around for more privacy friendly tools, I strongly recommend Privacy Guides.