Hey guys.
If anyone is having a hard time fixing ugly repetitions in textures as I had, this might help. I found a function called Texture Bombing which can be used in the landscape material blueprint, it randomizes the texture and looks way better. For example, here is a rocky texture (Basalt) without texture bombing:
And now the same texture with texture bombing:
Here is mine to give you guys an idea (I only set it on the rock layer for now):
You might want to play around with the parameters in order to get better results. Good luck!