You're not very clear here, but: go back into your graph and isolate out the parts that do a black and white mask, and use that instead of this colored version. Then to do that flipped and mirrored version there's "Symmetry" and "Mirror| nodes in the library, which you can combine with Transform 2D, that should be a simple…
Should use just a regular Tile Sampler, not Tile Sampler Color for your Mask. Additionally if your original Bitmap was 1/4 of the pattern, you could use the random mask in the original sampler without the need for a second one as the mask. If you don't have the ability to make the bitmap 1/4 the pattern in an external…