Reduce brightness of only lighter diffuse values in Material Graph

Material Graph challenge. After a light bake I have a scene where the lighter values of crowd agents, ie white shirts and flesh tones, are much too prominent. I need to adjust my material, bringing down the brightness but ONLY the lighter values of my Diffuse or Albedo. Can this be done in my Material Graph, or do I need to edit the actual texture?

could look into the clamp node. that allows you to clamp off bottom or the top of values.

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