The polycount seems quite high but your textures don’t look high detailed as well when you move close to the objects. Are you using PBR, LERP, Vertex Painting ? 2048x2048 or 4096x4096 textures? I mean you door LOD0 is 75k+ polygons so it is an high poly model for an object like a normal sized door and still I see a lot of detail (high frequencies) on the metal ornaments only while the wood textures look washed out lacking detail. The walls bricks textures I don’t know… you didn’t add a close up picture but if they are like the wood ones then you need to improve those too. At a distance everything looks excellent but an high poly modular set like this one needs to look very detailed everywhere and I don’t think you are going to set a cheap price, right ? The 2Million+ polys example castle you show can’t have the textures washed out anywhere, it would just be unacceptable if you are going for an high price… it must look excellent for FPS gaming as well and so moving very close to objects.