Create a new layer and use a soft brush with the color #9d9f98 with the opacity about 20% to give the mountains in the middle some soft effect. Use a layer mask if needed to remove any unnecessary details.
Make a Curves adjustment layer to bring more light to the middle of the scene. Paint on the rest to keep their lightness.
Use a Vibrance adjustment layer to enhance the final effect. Paint around the mountain 2 to remove the color effect there.