FIND A GOOD COMPOSITION
Debris and rubble materials are inherently busy. There is a lot going on but it is still important to keep composition in mind. It’s easy to get to the point where there is just too much detail that it becomes noise. You can add areas of rest by blending in sand or dirt over objects. In some cases you might need to introduce some bigger objects to help break up the detail. Keep playing with your Random Seeds until you find a composition you are happy with. It’s also a good idea to occasionally check your tiling in the 3D view to make sure your material isn’t obviously repeating.