Recently, my challenge has been to fully and completely open the Sahasrara chakra. Previously, during seated meditation, I would focus my awareness on the ajna (third eye), the Sahasrara, or the back of the head, and relax those areas. However, recently, in addition to that, I've been consciously focusing on the Sahasrara at the crown of my head on a fairly regular basis, even in my relaxed daily life, and gradually relaxing the Sahasrara.
While working, there are often many things to think about, so it's not always easy. However, when I'm doing work that I can do in a relaxed state, or when I'm riding a bicycle or walking, I try to focus my awareness on the crown of my head and gradually relax the Sahasrara.
I think seated meditation is more efficient, but I spend more time in my daily life, so the effects are gradually appearing. I can feel the crown of my head crackling or a feeling of something tightening, along with a slight release. I think this will take time, so I think it would be better if I could do it constantly.
In addition to that, I've recently started to feel a strong effect from the Khechari Mudra. Although I say I've started to feel a strong effect, it wasn't that intense at first. However, gradually, I've become accustomed to extending my tongue for about a month, and I've realized that directing my tongue firmly towards the area I want to relax is more effective. So, I've been experimenting with different directions, pointing my tongue upwards or towards the back of my head. In reality, the Khechari Mudra taught in yoga usually has a fairly fixed placement for the tongue, and it's not common to change the direction like this. However, the effect of the tongue's direction on how easily the area relaxes is absolute, so even though I haven't been taught by anyone, I'm using a highly effective method. Initially, I only did this during meditation, but now, in my daily life, if there's an area I want to relax, I keep my tongue pointed in that direction, and the awareness and the direction of my tongue cause the targeted area to gradually relax, crackle, and become soft. Once one area relaxes, another area becomes slightly tense, so if there's a tense area, I then focus my awareness and tongue on that area and relax it further.
Quite a while ago, it took a considerable amount of time to relax even once, and I would often feel satisfied and end the meditation after relaxing just one level. However, now, it's not just once, but dozens of times, and perhaps even more times that I can't remember, the area crackles and relaxes. Even after relaxing, it becomes slightly stiff again after a while, so I'm trying to relax it even more to keep up with the rate at which it stiffens.
Ultimately, the goal is to open the Sahasrara chakra completely, just like the Vishuddha chakra has changed, so that there are no energetic blockages at all, or to reach a state where it is partially open and then opens automatically.
Looking back, I think that if I had known these things (tips and principles), the Vishuddha chakra might have opened sooner. But, well, that's because I didn't know it at the time, so there's nothing I can do about it.