Likely you’re seeing the skylight leaking through your meshes and keeping the brightness high in shadowed areas.
Your options are:
-Baked/static lighting
-Trying to crank up SSAO to try to compensate for it (might be able to use the better GTAO if you’re using UE5)
-Use DFAO (this requires constructing scenes with good mesh distance fields, and likely means breaking up meshes, creating closed meshes, and cranking up the resolution in places).
-Try SSGI, but having to deal with screen space artifacts.
-Lumen