There is no need to hope! Luckily all firefox based browsers can be hardened, Librewolf is just hardened by default. I recommend using Arkenfox. It can be applied to your default profile or an additional profile.
I would say Zen by default is a bit more private than default Firefox but not by a lot.
On top of making an effort to be less paranoid, I have also been trying to organize my ADD and having multiple workspaces with vertical tabs really helped me. I have a profile that is manually locked down like librewolf so I am still pretty secure when I need to be.
I do still have librewolf as a backup as my secure clear web browser.
Been using zen for the last month or so and it has been pretty good. I went from using super locked down librewolf to using zen. It is not as private by default but can still be tighten down and with proper support for profiles you can compartmentalize it.
It does break and change a lot since it is in alpha but I used to be an arch user so honestly it doesn’t bother me too much.
Never accept the technology just because it is optional. Eventually it will become default and eventually maditory.