What is the best way to create a baclground between the sky and my scene?

Hi,
I’m currently working on a scene with a camera moving all around the character with the nishita sky texture in the background and a grass field. I was wondering what was the best way to make a seamless transition between my field and my foreground, knowing that the camera will have a 360° view of the environment.

The picture is a screenshot of my scene.

Thanks a lot !!!

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