As you can see below I'm getting this error and another one that states :fatal: unable to access 'https://gitlab.com/AyaanAbbasi/PersonalWeb.git/': The requested URL returned error: 500. I've got no idea how to fix it as I've signed in to the right account and this account created the repo and is incharge of that repo
It sounds like you're running into one of the issues listed here. You should take a look at this comment that links to the appropriate issues for tracking problems based on various authentication methods. If those don't seem to cover it, follow the instructions in the I have a problem with GitHub Desktop section of the project's README.
I hope that helps!