TL;DR: Smartphones useful but bad. Improve security and privacy, reduce bloat. Do tasks on a PC/Laptop instead or other gear.
Get a Google Pixel 5a and flash with graphene.
- Perhaps get a cheap second hand phone to try the process with lineage and keep as a backup.
Look into secure dumbphones (I doubt I will find anything good).
Get a compact camera for everyday photos and a professional one for quality photography.
Keep using phone but also use TOTP on Keepass (or eventually pass-otp?)
Try to get others to use a E2EE, open source, cross-platform messenger - currently Element is the obvious example.
At least Signal has Signal desktop.