Yours doesn’t look bad, why do you think that? When you see this in other games, there are usually more things on top of the texture, like trees, rocks, grass and other things.
And are you using normal maps? That could make a huge difference.
Edit: What I mean is that I don’t think the problem is with the textures itself, it lacks depth. And maybe with could get that with normal maps, roughness and other settings on the materials. But i’m far from an expert on this, like I said mine looks a lot worse. But I bet there are others on this forum that can help on this.