Not while keeping the Zorin files. You will lose the customizations and configurations that make this Zorin. Why do you need to upgrade the LTS base? This will be done with the next iteration of Zorin.
Zorin 16.2 already surpassed the Ubuntu 22 build, in kernel, library and firmware support... why would you downgrade? Because you don't have gnome 4?
Should you decide this route, you do it of your own accord. You will break your machine or end up with Ubuntu 22, not Zorin.
hasibul@hasibul-S551LN:~$ sudo do-release-upgrade -d
Checking for a new Ubuntu release
Traceback (most recent call last):
File "/usr/bin/do-release-upgrade", line 164, in
AttributeError: 'NoneType' object has no attribute 'upgrade_broken'
I have no idea. You're better off downloading Ubuntu's iso for 22. Zorin 16 doesn't support gnome 4*, it WILL BREAK YOUR SYSTEM TO ATTEMPT THIS. Just switch to Ubuntu.
Zorin 16 supports and is dependent on gnome 3.38. There is no changing this unless you compile your own iso and changing the Zorin's configurations to support gnome 4* yourself. It takes two experienced people about a year and a half to do this,
shouldn't be that much longer for you though.
It means that your current installed repositories do not support the action you are trying to take.
As others already warned you of: It means making the attempt will actually do a bit worse than Break Zorin OS. In that best case scenario, you would end up with Ubuntu 22.04 functional and whole but no more Zorin.
But due to the Repositories you have added being unable to support that... You would not experience that best case scenario.
Instead, the system would irreversibly break with no functional operating system. You would need to wipe and reinstall an operating system.
This is a small part of why it is not so easy to implement a safe Direct Upgrade option and why much must be done to prepare one that users can rely on.
What you can do is Install Ubuntu 22.04 from an .iso if you wish for that environment immediately.
But this forum cannot assist users in breakage. We can assist in repairs as best we can.