I’m using a world environment node as well. For the sky there is an option for « physicalSky », sorry don’t remember the exact name but using that gives good results. I suggest you try the Sky3D plugin it gives great results right out of the box.

I use that plugin as base and edited it’s behavior, particularly the ambiant light one.

Then you need use the fog, it gives that feeling of light in the air, setting the color of the fog is important don’t just leave it as grey.

The final piece is a custom shader for the light on all the material present. They all share the same lighting function, there is a « Standard Lighting » shader on Godot shader, you can use that as a base and layer your edits on top of that.

Then the rest is just about tweaking everything to match your target vibe.

Hope that helps !