Help with a Parametric Grasshopper Script

Hello there, I’m very new to the forum but I would like to inquire about a Grasshopper Script. My goal is to make a parametric figure similar to the wall aspect of this AI generated image.

I’m trying to make an arc shape for that bottom boundary, but all the points are converging towards the first point in the list, and i’m not sure why. I started following a tutorial in order to get a start for what I needed.

image

Here’s my file below:
PARAMETRIC.gh (18.8 KB)

PARAMETRIC Edited V0.gh (9.7 KB)

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Thank you so much! I really appreciate it!