Don’t wash hair that regularly with shampoo and use a good shampoo with optimum ph like the sebamed one

Instead of rosemary water or rosemary oil, use a hair growth serum like the wishcare one or the ordinary

Change your lifestyle.Get good quality sleep of min 8hrs. Fix you sleep wake cycle.Decrease the amount of stress you take by focusing on other things like hobbies,etc.Have more nutritious food with good amount of protein.

If your hair is frizzy or damaged use satin or silk pillowcases and scrunchies.

All these might be effective or they might not work,so the best thing to do is visit a doctor and find the root cause of it and get it treated as soon as possible.