The subject has great potential. I would keep working it.
The light at the time the shot was taken was uninteresting (middle of the day?) and so you were up against it when it came to processing.
The castle ended up dead centre after cropping. Don’t forget your rule of thirds.
The cloud top right is a little heavy. I think I would back that off a bit to restore some balance.
I like the contrast enhancements to the water, the trees and the castle.