Additional Light

Hi, Dear.
I’ve baked Ex/Internal scene, the outdoor is bright but the internal space is dark. I think I have to add some additional lights. Unfortunately, after adding some spots lights, I got a very poor result.
How can I solve this issue?
In fact, it’s very awful for me to avoid this kind of issue related to shadow such as blotches, dark/bright, …
Please help me asap.

Could you share a link to the scene with us?