Did not work for my unfortunately
However I managed to fix it with the help of a friend. She told me to type ls ~/.local/share/kscreen/ which outputted a bunch of files with seemingly random inputs of numbers and letters. Apparently those are saved display settings that can override xrandr. Then I can run rm ~/.local/share/kscreen/* (For anyone else trying this, be sure there are no typos!)
That did output an error:“rm: cannot remove '/home/user/.local/share/kscreen/outputs': Is a directory”
I then tried: rm -rf ~/.local/share/kscreen
And more than last time, be sure there are no typos!
This deleted those files. Afterwards I rebooted my PC and I was able to see my desktop again!
Be aware that you will lose your saved display configurations. But all I had to to do afterwards was right click my desktop, go to Display Configuration and and re-arrange my screens.
I hope anyone who encounters this problem finds this post.