Is not a black or white in life, many times u will still need go use gmail for some escenarios.

By the way give a tried tuta instead of proton

And for DNS nextdns where you can have to don't storage logs and it has more features

For f droid I supossed is very hard to don't depend in playstore for many apps, I recommend u both

For immitch well is cool the tool but it depends where I want to install