The 3 days of settings adjustments, debloating, de-spyware-ing, regestry edits, group edits, service edits, power edits just have a functioning OS that doesn't bottleneck/ruin your espensive hardware you paid for.
Meh Firefox is very customizable but not a ton of settings really for critical privacy, compatibility or optimization.
Chrome and all Google services can get fucked for just the amount of sites, pages, sub-accounts you have to navigate thru JUST to turn off their tracking bullshit.
I think I have my android and PC as fully isolated from any Google account, software, service or operation short of going full Root of phone and Linux. Which, Linux is on my todo list to go daily driver-Linux and 2ndary boot drive-Windows.
For now tho, local user Windows account and all google accounts and apps either un-installed or disabled on the phone.