Aw you'll get there eventually, it took me a while to get this too. I think I winged the last couple of steps cuz it was just too confusing XD It's easier to start with simpler models like these [link][link] cuz it's basically the same principal but with waay less precreasing.
Hmm, are you using these instructions? [link]? Because it's all still pre-creasing at step 30. It helps to draw the lines too so you don't get lost and compare what you're doing with the picture at each step.
Okay, so you see where the two red lines intersect at the center? There should be two blue lines intersecting at the middle as well. They're pre-existing folds so you shouldn't be making any new creases. (I hope that's clear haha )