Here you go

OK, looking at your INXI readout, it looks like you have dual GPU's just as I do. You have your Intel UHD GPU, and you have your Nvidia 1050 GPU. I'd like you to try something and lets see if we can fix this problem with a simple extensions...
Please install Nvidia Prime Indicator
https://extensions.gnome.org/extension/1275/prime-indicator/
And once activated, its going to be found in your taskbar, as seen by the picture they provided on the page. Make sure you have enabled Gnome Integration in your browser, then just click the on/off button toggle to install and activate.
I want you to select your Nvidia GPU only please with the extension in the taskbar. Yes, Nvidia GPU only, no Intel, no hybrid, just Nvidia. This should tell your system to prioritize the Nvidia GPU only.
Now lets see if you still have the same problem. If you do, I might have to recommend that we disable suspend capabilities in your system, as well as disable the notebook LID-Switch.
Can you please try:
sudo ubuntu-drivers autoinstall
sudo systemctl disable nvidia-fallback.service
sudo nano /etc/default/grub
Arrow key down to this line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
and change it to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nouveau.blacklist=1"
once done, run
sudo update-grub
Reboot and test.
3080?!?!
!!!

Me with my measly Intel HD 5500. 
I thought you were gonna says WOUZERS with this GIF
And yeah, I am sorry to say, I think even my Intel integrated UHD beats your Intel HD GPU too.



Awww, no cry Yuk, you are still amazing to me, no matter what kind of computer you have. You could literally be running on a potato, and I'd still like ya.

This is what it fetched

I do not believe that the Nvidia-390 is supported along with the 5.11.0 kerneal used by Zorin.
You should be able to install the Nvidia-460.59 driver to enable that support:
sudo apt install nvidia-460
I get this error.

Try adding the repository, first:
sudo add-apt-repository ppa:graphics-drivers/ppa
Then see if you can get the dkms package:
sudo apt install nvidia-dkms-460
Still having some issues

Can you try:
sudo apt --fix-broken install
sudo apt install linux-modules-extra-5.8.0-41-generic
sudo apt install nvidia-dkms-460
Still same issue
sudo add-apt-repository --remove ppa:graphics-drivers/ppa
sudo add-apt-repository ppa:ubuntu-x-swat/updates
sudo apt --fix-broken install && sudo apt update && sudo apt full-upgrade
When complete, check and tell me which Nvidia Graphics driver it shows you using.
Here you go

Ok, you are on the 470 driver.
I need to head out, will be away from computer for a few hours.

