Quite easy.

Graphene + Orbot/InviziblePro/TorVPN/I2P

Then only install open source applications through Obtainium or F-droid for communication.

Everything else is a fragile distraction that will fail sooner rather than later so no sense in trying to make Google, your bank and all those fiat shit ID apps work.

Better to focus on the essentials and get the work done.