Do this, first what is your video card?
Next get DDU from here: https://www.wagnardsoft.com/forums/viewtopic.php?f=5&t=3271
Then download your STAND ALONE DRIVER from here select it from the list Verison 442.50: https://www.nvidia.com/Download/Find.aspx?lang=en-us
Flickering has been on going for a while and with Winver 2004 it has gotten worse but this driver has been really really stable. I myself had issues and assisted a few others experiencing what you are now.
See here:
Texture Flickering - #19 by Dokkan-stormrage and here
Strange graphical flickering - #16 by Caterpepi
Best solution I have found is to go back to 442.50 It performs really well in comparison to most drivers anyway which you can read here if you like: https://www.reddit.com/r/nvidia/comments/fgan4g/nvidia_44250_whql_driver_performance_benchmark/
vs another driver here : https://www.reddit.com/r/nvidia/comments/g4pbaz/nvidia_44587_whql_driver_performance_benchmark/
When using DDU be sure to unplug your net before you restart in safe mode because if not windows will auto install a driver then you are stuck with DCH and must get the NVCP from the windows store, personally I don’t like the store being an insider it gives me a lot of issues lol. So steps as follows:
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Unplug net after downloading drivers and DDU or go into device manager and network selection and disable wifi/ethernet adapters.
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hit your windows key and type in msconfig hit enter, select boot tab and click safe boot hit apply and ok it will ask you to reboot, do so it will take you into safe mode. When you do this you will need your pin/pw to your account if you don’t know it make a temporary admin account for the machine before doing this.
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after being booted into safe mode extract DDU and open it but do not run it yet. It is important that you re-open msconfig or you can find yourself in a boot loop of safe mode, so just re-open msconfig like above and back to boot tab check and uncheck the safe mode box, hit apply and ok but do not restart yet.
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Go back to DDU window and select GPU from the right drop down box. select clean and restart. Doing this it will remove Nvidia drivers and traces and then reboot your machine.
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once rebooted your resolution might be wonky and or abnormally large this is normal. From here go to your downloads folder and select the driver 442.50 and install it. Base driver IMO ONLY not the GFE(geforce experience) So you would want to select Driver only and let it install.
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Optional maybe, sometimes drivers want you to reboot after installation, this is good practice to perform. I would do it regardless, But before you do either replug in your net and or go back to device manager and re-enable your ethernet/wi-fi connection so your net works when it comes back.
Lastly log back into wow and see if the flickering still occurs in my case it did not. nor a lot of others. However each case can be very unique in how it got there. I do know that if you go to the Nvidia forums they will have you do these exact steps, and then some! feel free to look and gather on your own though I am only trying to assist you.