Quereller

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

Just be aware what you install. Check the developer name and the whole path.
Some apps on F-Droid are limited for example but you can download the full featured app from Github. Later updates are anyhow cryptographically signed.

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. …

If you need Google Maps from time to time use GMaps WV it is a a webview shell for google maps.

You need a Dutch oven or a similar device to bake in hot coals.

Cholera

Look at ancient Egypt. Big piramides didn’t work. Getting your name erased from the society (Tutankhamun) somewhat.

Now imagine what current generation spy satellites can already do.

The legislator, because you have abysmal renters rights. Landlord inspection WTF.

Stock Android has so many additional components (assistant for example) compared with GrapheneOS.

KeepassXC and Keepass2Android

This is exactly what I have diine and also suggest.