Everyone seems to have this so try this one:
1. Stack your elbows by putting your hands on opposite shoulders. One hand should sit on top of the shoulder, the other hand kind of under and around your other shoulder to grip it if done right.
2. Drop your head forward.
3. Lean forward and to the right, forward and to the left, etc. so you can stretch this muscle group out.
Research nerd girl here:
If you want to fix thinning hair - regardless of sex - pls use a midoxinil AND a dermaroller together, and use Cecred's edge serum, which is holy grail status right now for this issue.
Oral finasteride is another option that has a good side effect profile but some ppl do get curb stomped by it.
DO NOT WAIT. It is way harder to get your hair back than it is to prevent loss.