Your scene… is extremely dark. Why dont you add a directional light and a skylight to support it… play around with just those 2 lights 1st and brighten up the scene… and for any other artificial lights, add non-shadow casting fill lights to dark areas and bring the map to life
yeah i wanted it to be a dark scene but i think i may have overdone it, i turned the light source all the way down so that i could get the night sky box.
What are these “non-shadow fill lights” you speak of?