It may overlap with the spine to some extent, but I can now feel the same energy from the sacrum gradually rising along the skin of my back.

The things I'm doing are not much different from before. I concentrate on the ajna chakra between my eyebrows and draw energy from the central energy channel of my head, directing it towards my chest (perhaps cosmic energy?). I don't know exactly what kind of energy it is, but energy enters from the ajna chakra, presumably from the universe or a higher dimension, and I direct it towards my chest, and then fill my body with it.

When I do this, the energy around the sacrum also becomes somewhat activated. However, it doesn't seem that the energy entering from the ajna chakra and the energy of the sacrum are directly connected. They seem to be slightly different energies, but somehow, I think they are indirectly related. The evidence for this is that when energy enters from the ajna chakra, the energy of the sacrum also reacts and becomes activated, albeit slightly. The energy in the sacrum area doesn't react as quickly as one might expect, but it seems to be reacting to some extent.

When I continue meditating without paying much attention to the sacrum, suddenly, an energy similar to the energy of the sacrum appeared "popping up" along the back, between the sacrum and the chest. This is probably a place where energy accumulates, and it seems to be trying to move upwards, but it's blocked, so it's accumulating there.

Furthermore, a few days later, the same kind of energy appeared again along the back, behind the chest. It seems to be gradually extending upwards from the sacrum.

The thickness of this energy channel is not very large yet, but I feel that energy is rising along the skin of the back, or in some parts, along the spine, (a little behind the energy of the anahata chakra in the chest).

In addition to this, the energy bundles that run through the entire body remain unchanged. In addition to that, a different energy has emerged, extending from the sacrum to the back of the chest.

Currently, it reaches around the back of the chest anahata chakra, but it remains to be seen whether it will extend further upwards.