Then, I would suggest to switch to X11/Xorg first to see if it helps. to do that, go to the Login Screen (not the Lock Screen). Simply reboot for that. On the Login Screen click on Your Profile so that the Password Field appears. When it is appeared, You should see a Gear Icon in the bottom right corner. Click on it and choose the Option ''Zorin Desktop on Xorg'' and then log in and test if Your Ethernet works.
If this shouldn't work, You could try install this Driver: