What changed it for me was going natural, and I mean properly. Frøya, a small Norwegian brand, the same one whose balms I already use.
A shampoo with argan oil, which doesn't leave my scalp feeling stripped. A rosemary water I spray on my roots at night and massage in for a couple of minutes, which is honestly the nicest two minutes of my day. A few drops of serum when I remember.
A few months in, my scalp is calm. The itch is gone. My hair feels like hair again, soft without that coated feeling, with more lift at the roots than I've had in years. The frizz is down.
Give it a few good things, and it remembers how to take care of itself.