M-shaped hair loss concern

I never thought I would worry about this when I was young. As I got older, my hair started thinning gradually... and now I have an unsightly hair loss along the hairline.

These days, it's getting hotter, and when I tie my hair up, it becomes more noticeable and I dislike how it looks. My dandruff is increasing, and even though it's time to wash my hair, my scalp hurts, so I'm reducing the frequency. I'm curious about how to take care of my scalp in such situations~