Can you give us more information.
Was this a new installation, or since a software update that included kernel change from 6.5 to 6.8?
If the latter, can you boot to grub menu> select "Advanced Options for Zorin"> select previous kernel generic (e.g. a 6.5 kernel) and try that.
FYI: Re kernel 6.8 and Nvidia: After update, display is really slow and screen is tearing - #6 by AZorin