Blender 4.02
Create a Terrain (1) : bake a B&W diffuse map
00:00 add a plane and adjust camera
00:36 add colorramp, noise, voronoi,texture coordinate, mapping and adjust value
01:44 add image texture and bake diffuse map
02:22 result
※If you already have a complete model, you can try to bake "ambient occlusion".