Materials for good viz

Hi! I am new to archwiz for UE4, has experience with Vray etc and tired of the long loading time, especially the light etc.

Anyways, I was wondering on how to get high quality materials without buying them? I see 4k resolution textures etc but was wondering if I can make my own? Or if there is a free download page? I have found several texture-sites but they are usually older, low quality, 4k, forget about it!

Look into Substance Designer or Quixel Megascans. is another one which more caters the games industry but there are still some good tiling textures on it. for making normal maps and or roughness and ao maps

Been looking aroung myself. Like ready to go ug4 material so i can study them too. Not too much honestly.