I would try to give a psuedo-abandoned look.
Get some of these: https://www.amazon.com/Realistic-Miniature-Simulation-Architecture-Landscape/dp/B09JBXW8WW. Put them in strategic places, like moss growing in some places: https://www.amazon.com/Terrain-Miniatures-Landscape-Artificial-Railway/dp/B07KSR86MV
Then paint some rust stains here and there.