Autocontrast 100%
Autolevels 20%
Autocolor 50%
Selected the shadow in the bottom-left corner (feather 5 pixels). Autocontrast, then tuned the colors with Replacement colors tool, to match the rest of the stone.
Enhanced the stone colors by raising the saturation 15% on yellow and red channel.
I decreased the brightness and increased the contrast, then sharpened. I also cropped the top part off to avoid the too bright area of sunlight in the right top corner. I hope you like it! I had fun playing with your grand tree photo.