There are several degoogled OS options for the Fairphone models, with different levels of degoogling and privacy: LineageOS, CalyxOS, DivestOS, iodéOS and /e/OS.
Most of these are based on LineageOS (I understand that CalyxOS isn’t, but I might be wrong). I personally use iodéOS and I like the helpful developers, the ability to remove / replace any of the apps preinstalled with the system, and the iodé blocker which blocks trackers, adds and any connection you want to at a system level.
Librewolf + uBlock Origin on desktop. Mull + uBlock Origin on mobile.