B&W day for night footage help

Hello! I am editing some footage that was shot during the day that is supposed to look like night. It looks very nightlike, and I was able to make a mask of the sky and darken it. There are still some spots of the image that I would like to darken and need some ideas with how to go about it. The shot is the side of a garage, and there is a moving shadow of some branches and some very bright spots of the garage from the sun. Is there a feature where I can select the specific shade of grey made by the sun and replace it with a darker grey? Or maybe there's an easier way!
Thank you!
Thank you!