Modifying curved step-downs into smooth transitions

Hello, I use an extension that I helped build that creates retaining walls from an external application and the model that gets created draws blocky step-downs for the ground at bottom and top of wall like shown below:

I’m wondering if there’s an easy way to modify the model and smooth out those blocky transitions into more of a smooth hilly look. I don’t know if it matters, but the walls and grass sections are all created with follow-me commands and therefore are not smooth curves and are actually pretty jumpy when you zoom in.

Here is the .skp file for this small wall: test_smoothsteps1.skp (2.9 MB)

Thank you for any help!

I like to use “Soap Skin & Bubble” for making grass. After drawing the border, you can use the tool to fill it in.
https://extensions.sketchup.com/en/content/soap-skin-bubble