I would go for a few beat up cars and realistically damaged building and streets.  I have a couple of Sci-Fi outfits that have materials that look 'well worn' yet there is little around to build a scene where such outfits are not massively out of place.  In one instance the only material option was worn and dirty and I spent a long time modifying the images to make it look like new just so I could use the outfit.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.