Stop using Facebook, Twitter, Instagram. Use Signal, try to avoid email. Use Duckduckgo instead of Google Search. Use a good adblocker. Pay everything you can in cash. Something like that?
Ads are not the only way FAANG tracks you. You need to get rid of everything owned by them like your Android phone (yes, the hardware, apart from the brick, is only licensed to you, so still owned by them), Google maps etc. And find alternatives like S60 phones, Openstreetmaps etc.
Yes, that's what I'm talking about. Even tho you delete everything (accounts, data etc.) you are still left with several insidious ways any company can track you. Eg. you can delete anything from your phone and even reinstall the system from groundup but you will still be tracked based on the hardware configuration...
Consider buying a cheap feature phone. Keep it turned off as much as possible. Avoid SMS as much as possible. Use other methods for calling. (Perhaps Wire…?)
Aso, consider if all this trouble is really worth it. IMHO, it’s not. YMMV.