Megascan Landscape looks like Playstation 1 graphics

Hello Devs.
I have now done the work to create a LandscapePaint (several layers) to finally get started with the visuals. Well… I have high-resolution textures from Megascan (downloaded via Quixel Bridge) and then merged them into a new material. You can see what it looks like so far here:

This looks… not good. No idea why. I’ve tried a few things, but nothing has really worked.

Here’s the journey of this specific texture from start to finish:

Is there anything else I can do, am I just stupid, or is Megascan not meant for large areas?

It’s not just MS, there is literally no texture you can blow up over an entire landscape, and it will look ok.

It’s a good idea to find about how to hide tiling and make no repeating patterns in the material