As the others have said, there is way too much empty space to the right/top of the frame with absolutely nothing interesting in it. If, and that's a big if, the picture can handle quality wise such a heavy crop, I would basically crop (from left to right) just until the winglet, and same for bottom to top. Then the center of the picture basically becomes the shadow with the rainbow effect. However, even so I don't know if the motive would be good enough, but at least probably worth a try.
Just sit back, relax and have a glass of Merlot...enjoy your life!