A really REALLY bad choice is to make a Reshade shader for it, the issue with this is it would be client-side only and laggy as hell.
But if you really want it, a good area to start with is coloring everybody a specific color (like red) and enable the Sin City shader (I have no reference to the specific shader pack) for this will make every other color except for red have very low contrast.
Don't blame me if this doesn't work, it's a theory and a really bad one at that.