The website below, is one of my favorite places to source textures that I may not be able to find in the platform library.

You do have to create a free account to download, but it will become an invaluable resource for your modeling.

Just a note, these files are pretty large (most won't upload to the platform at the original size), so after you download and extract them,

you'll need to open them in either Photoshop or Canva to save to a smaller size.

https://www.sketchuptextureclub.com/