Hi Tyoungir,
You’ll want to add a post process volume to your scene. The values you want to focus on tweaking are the Auto Exposure (Eye Adaptation).
Set the Auto Exposure Min and Max Brightness to 1.0. This will correct the majority of the brightening up that happens in your scene. Also make sure that the Post Process Volume has the option for Unbound checked so that it works for the entire scene and not just when you’re within the volume box.
I hope this helps.
Tim