I like the design a lot, but the materials and details need some work. Try some light grunge effects in the roughness and overlaying a curvature on the roughness too. You really should use an emissive map too if your going to have lights. Last thing is increase the normal intensity node towards the end (the one that is 3rd from the end from your main height) to 3. I did that and it helped a lot with the metal definition. Just doing the emissive map and normal map intensity changes made this difference. That's no even making a nice emissive or roughness changes.