After Upgrade to F39 from F38 Nvidia Drivers No Longer Work

This may be a result of the common issue shown here.

Simple fix for most.
sudo dnf remove kmod-nvidia-6.6.8-200.fc39.x86_64
sudo akmods --force

It seems that with F39 especially the driver may not get properly built before the system reboots during the system upgrade. There appears to be a proper driver installed but it fails and users often have to remove the driver then rebuild it with the 2 steps above. The dracut step usually is not needed, but it is good insurance.

If you do use dracut it seems best to remove the relevant initramfs image before running dracut. In your case that would be sudo rm /boot/initramfs-6.6.8-200.fc39.x86_64.img before running dracut.

Would you also show the output from dnf list installed \*nvidia\* please.

Just for future reference, that guide is somewhat out of date. The only packages needing to be installed are akmod-nvidia and possibly xorg-x11-drv-nvidia-cuda. Dnf with the dependencies it pulls in handle everything else needed.
dnf install akmod-nvidia xorg-x11-drv-nvidia-cuda is much simpler than the long and unnecessary list of packages in that guide.