How to reform the origami shape?

hey guys, I was wondering how this waterbomb origami can form a dome-like shape? (1st pict)


but my model (2nd pict) just stuck at folding. when it is folding, it keeps moving 360-directional in slow motion and has a flat top

What should I do to make like a dome-like shape, what tools do I need?

I imagine that I could use like point attractor or anchoring point but the model still fold not messy (half-fold maybe)

I learn grasshopper since two weeks ago. I think I could use some of your help!