Thanks heaps guys, that’s a great help.
I did try tracing the shape and adding straight edges to the middle, but got weird results – most likely an error on my end.
The plane method worked really well. I wouldn’t have thought to start with that, suppose I just have to practice these little geometry puzzles to get the hang of it.
It’s nearly perfect now, and good enough for my use case in a logo animation. But out of curiosity, if I wanted to sharpen the bottom edges, but keep the curve, how would I go about that? I think I need to add supporting edges, but I’d need quad topology to do that wouldn’t I (at least on the bottom face)?
https://www.dropbox.com/scl/fi/rmut03242pjfipl6sdv7u/star.blend?rlkey=h6azbvmmhsjfs6y2axjrbo0zl&dl=0


