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High-Poly Electrical Switch

It is too clean-looking. These things have lots of dirt and stains

yes, but they don't look too different if they're there.

@Henrietta Baking in the texture = manually adding shading to the texture so that it appears darker in certain spots without any light sources (as in the newest screenshots)?

AO means ambient occlusion. While that in itself refers to how light behaves when bouncing around between surfaces, for models, modelers often bake a shadow to the texture to mimic a more realistic shading rather than relying entirely on the in-game shading system for more controlled look and also to lessen the burden of processing power.

I'm not sure if you made the model yourself or used a model created by someone else. If the latter, try to see if there's a fully grayscale texture. If there is one, open both the main texture and the AO texture in an image editing software and set the AO texture's layer render mode to "multiply."

If you made the model yourself, then you'd have to learn how to bake the shadows in a 3D editing software. I'd recommend searching for tutorial YouTube videos.

@Ceno: The colors appear flat because that's generally how baked-enamel enclosures and corrosion-resistant wires look (and also because I put more effort into the model than the textures).

@ Ｊａｋｉｙ: The wire colors are deliberate; see the reference photo I added [red = hot #1, black = hot #2, white = neutral, green and bare copper = ground]

Change the wires color from red-green-white to black-white-yellow would makes more sense.

This is a good prop to replace, but if the model does come with an AO texture, you might want to rework the basetexture or use $color2 to darken the overall model.

Feels like such an odd prop to replace, also no offense it just looks odd. There's no baked in lighting or ambient occlusion, everything just looks flat.