There are Linux distros like Tails which will be very hard to use day to day, but if you are laser focused on privacy, it's between that and CubesOS (not Linux).
QubesOS. Also TailsOS isn't too bad if you do persistent memory and don't mind slow internet traffic over Tor. I find it plenty usable for simple browsing and downloadikg small files.
Holy shit, it would be so funny if this started an 80% 3D printer market.