Should I sell a guitar that looks great but sounds terrible and is hard to hold?

I purchased a guitar new in 1994, custom made to my specs. It looks lovely. It's very comfortable to play if standing up, and it sounds ok when in a band. But I play solo almost all of the time, and as I get older I usually sit. This guitar sounds tinny and weak, is always out of tune, and hard to hold while sitting. But I wanted to love it because it was my custom order, and it still looks totally awesome. If I sell it, I could buy another used guitar with the money, and find something much more suited to my playing style. But I'd be lucky to get $400 for this guitar that I paid $900 for. I'm so split on what to do. It's basically an outdated piece of jewelry.

I have kept it for this long because I keep dreaming it will sound better someday. You would think a $900 guitar would sound great, but this one does not. Buzzing all over, cannot get rid of the buzzes.

I love the feel of this guitar, a GREAT neck and body. I guess I'd call it the model wife who isn't good for anything around the house and has a terrible annoying voice. But if I started a business she would be a great assistant. But... I don't have any plans to start a business.