I created a new unity scene for this project with a full terrain with ground textures, grasses, different types of trees, wind effect and first person player controller and some post-process effects. I tried to create a dark deep forest environment in night time. To create this environment I added a package manager content called Urban Night Sky from Unity asset store and added into the sky box material from the Unity lighting environment. I also added the fog density on 0.04 to make the dark atmosphere.
Here is the link of the video: https://youtu.be/YBYGJ45ifZs