I don't have these lights, so I can only go by the description of them.

They sound like they are HDRI files and render settings, with no free standing or other lights.

Make a new file and apply your original lights. This should get you back to your baseline. Save this scene.

Go to File > Merge and select your model scene. Save this as a new file.

Try rendering it out and see if the lighting returned to what you want.