GrapheneOS is the way to go.

Choose a privacy preserving browser like Brave, get a VPN (Proton Mullvad, nostrich one's payable in SATs/whatever), install Tor, then start saving and exporting all your app settings on a USB key.

Keyboard: Futo. Zapstore & Obtainium for the good stuff, maybe F-Droid as a fallback. Play Store without Google Account: Aurora Store.