Hi delta halo. I'm sorry for the frustration. I've run into this issue in the past with a different version of visual studio, but the exclude/include trick worked. Have any of your scripts worked on this project? Not sure if it would help, but could you try using a previous version of visual studio, like visual studio 2017?
I'd also recommend hopping in our discord server. You'll get quicker responses and a lot of experienced unity developers that would be happy to help you out.
Taylor @GDQ