Quereller

I am using Tutanota as my e-mail provider and it’s quite OK.

You can already do a lot!. Switch of all the invasive features from google. (Remove advertising ID, switch of any web and app history etc.) Install F-Droid and only use the “good” apps. Put the evil apps in a separate work profile (Shelter app). Look at the configurations of the apps and opt-out of tracking.
Configure your webbrowser to delete cookie and co. …

Now imagine what current generation spy satellites can already do.