After the back of the head loosened, the energy channels (nadis) that run from the back of the head towards the top of the head (Sahasrara) began to loosen.
In terms of order, it seems to be following the routes listed in the Flower of Life, although I didn't specifically intend for it to be that way.

Indeed, there is something similar to the "half step" in the Flower of Life, located around the front of the back of the head, but it seems that even if you think of it linearly, there is no apparent practical problem.

Until recently, the feeling was that various parts of the head were simply loosening, which was a scattered feeling, but now, clear routes have emerged.