How can I make the terrain look less metallic and more natural?

This is an image from a map I made using 3D cubes, but the cubes don’t look like a grass cube but more of a green metallic cube… and the way the light reflects from the cubes make it feel even less natural. How can I make this cubic environment look much more “natural”

Click on the Material and adjust two sliders. Metallic and Smoothness. You can apply other options as well like some texture or different settings in the Material.