Hello there! Just wanted to pop in, and as you are asking for suggestions, maybe more ground-cover such as small rocks, debris, bracken/bushes and the like, just to break up the appearance of the ground and lessen the effect of the ground-material tiling somewhat?
For example, a making one of the singular trees into a copse of trees with bracken, adding smaller rocks or pebbles around the larger rocks, maybe adding debris-piles using the sand material, rotating so it doesn't disrupt the direction of the materal akin to sand-piles, even adding some meshes around the building that'd make sense, like spare parts such as the occasional metal sheet, buckets, trash/rubble patch, or perhaps add a awning/ceiling extension, some additional visual interest, and generally stuff you might expect at a shop in such a pleasant place. ^^
Going further, if you can destructible objects, something as simple as... say, some planks between a few posts that can be broken off, a bin or crate that can be blown apart, or even making a copy of a small rock-mesh, and ticking the 'can become dynamic' box in the mesh-editing/inspecting window (double clicking the mesh in the general browser window, I think), you could have pebbles that players and zeds can kick about, just 'stuff' that can add some visual detail, and be interacted with.