First: I have to apologize for something. I wrote here:
but there is one i in nvidia too much. It must be sudo apt install nvidia-driver-535 I have it changed.
But when the Driver is installed, it seemes that You have wrote it correctly. So, now the Driver works with the 6.5 Kernel but not with the 6.8 Kernel, yes? You could try it with the 550 Driver instead.
For this You have to remove the old Driver first with sudo apt remove nvidia* libnvidia* like before and then install the 550 Driver with sudo apt install nvidia-driver-550 (this Time are the right Numbers of i's).
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Thanks,
I will test it when I am back at home.
But I first have a question. The 550 driver is not shown in the menu. Is it still working for my device?
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Yes, it isn't shown in the Menu; that is right. But it is available in the Repo's. You can check that with apt list nvidia-driver-550 in the Terminal:
Why it isn't in the List, I don't know. Maybe because it is a newer one. Not the newest, but newer than the one's in the List. Maybe Zorin have added the Driver; could be a Possibility, too.
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Ok, I now tryed it, but it still dont work with the new kernel.
Do you have any other ideas?
Hmm ... You could try a newer Kernel but that don't guaranteed that it runs ... So, at this Moment ... When the 6.5 Kernel with the 535 Nvidia Driver works, You could use that for now. When the 6.8 Kernel gets Updates maybe it will work better in the Future.
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Ok, thanks 
I will wait some time and inform here when it works.
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It still dont work with the new one. I will keep waiting and informing
