I made a complicated contour line drawing with a Bic pen that I used image trace on, and I am hoping to vectorize it to engrave with a CNC. The paths look good, however they are outlines not pen tool-esque paths. Is there any way to convert them into single path, not a closed shape? I'm looking at answers about creating a centerline but none of them seem to have a definite method. Thanks!
What I have is in black, an approximation of what I want is in red below.