Things I have done:
-install adguard and route all my traffic through it
- enable always on VPN and block connections without
-firewall all apps to block internet connection
-only allow apps the apps i want to use internet on
-replace everything I possibly can with FOSS software
-disable everything google and use helioboard as keyboard
-install shizuku and canta to debloat as much as I can
-route all traffic through orbot (except apps that require me to login)
This is probably overkill but that's the best I could do on stock android 🤭