A little while ago, I also felt a crackling sound in the back of my head and it would suddenly loosen. This time, however, the area behind both ears gradually activated like static electricity, and then the back of my head also started to activate. Furthermore, the lower middle part of the back of my head loosened repeatedly.

Until recently, the frontal lobe was loosening, and now suddenly the area behind the ears and the back of the head are starting to loosen. It seems like my head is loosening different areas in sequence. When one side loosens a little, it then loosens a different area, and it feels like the loosening is accelerating overall.

Incidentally, in some spiritual traditions, it is said that a (invisible) crystal is formed above the ears at a certain stage of growth, allowing access to records of past lives. Also, a (invisible) crystal is said to form above the eyebrows, and a rainbow-colored arch of light forms from the "third eye" on top of the head, allowing one to receive the "language of light." It's possible that my recent ability to "understand English as English" is just the very beginning of this kind of growth process, and if that's the case, the goal might be to understand the (light) language beyond language, to transcend the barriers of language. I will keep this possibility in mind.

This stage usually lasts for a short period, about a day or so, and then it returns to loosening the area around the top of the head, focusing on the vertex.

At this point, the loosening in my head is mostly settled, and it feels like focusing on the love of the heart will lead to faster overall growth, rather than concentrating on the next stage. After all, if the heart opens, things like the ajna (third eye) will also be activated. I have been consciously trying to activate my brain for the past 1-2 months because it hasn't been very active, and I think I have been able to activate it to some extent, so I will continue that, but gradually shifting the focus to the heart might be better.

Even in this state, the sahasrara (crown chakra) still feels stiff. I continue to collect energy, concentrate, and make it crackle while loosening it, day after day. Previously, the aura was mainly filling the inside of the skull at the vertex, but now I feel like the aura has started to penetrate slightly above the skull, so I feel like I have progressed a little, but it still doesn't feel like the sahasrara is fully open.

The center of the head also still doesn't feel completely open. However, it feels like it's progressing a little bit compared to before.