Unable to fix wrong display resolution

I’ve pretty much tried everything from looking up all kinds of solutions, but no matter what I’m unable to fix this issue for some reason. My resolution should be 1920x1080 with a refresh rate of 240hz. However, it’s showing 1024x768 60hz with no way to change it to anything else. Does anyone know what I can do? One final thing to note is it was working fine this morning. Edit: My GPU is Nvidia.

We need a lot more information.
Gpu is Nvidia but what driver are you using?
What is the DE/WM?
What kind of connection is it?
Is this a single monitor setup?