I know there will be others who have more experience in resolving the image to a more enhanced degree, but I've done two adjustments to your own with a little brightening and contrast change, also adjusted the lever to straighten it up a touch.
The top skylight window looked a tad offline, so altered that to line up better. I've added two different shots, one with the windows repaired,
Regards Mike 'Silent Cougar'
Question: What's the point or intent of the picture? What are you trying to show? Without knowing that I'm left with the idea of making it more graphically interesting.
As it is I see clutter and confusion ... visual chaos ... which the world is full of, especially WRT derelict buildings. Why would anyone want to look at more of that? (I'm assuming the color and contrast are due to it being a screen capture.)
I believe it would have helped to have a clear idea of something specific to show and ideas about how to make that visually interesting before taking the picture, but you could try to impose some order, design or composition on that by narrowing or focusing attention and increasing impact. Maybe something like ....