How many hair loss treatments are recommended?

At some point, the amount of hair falling out increased every time I washed it, and when I take selfies, I notice that the parting at the crown of my head looks sparse. I've tried changing shampoos and taking supplements, but home care just isn't enough to handle the thinning hair that feels like an empty shell.

Whenever I visit dermatology or scalp clinics, it seems many recommend hair loss treatments like mesotherapy or exosomes. I am seriously considering whether to begin hair loss treatments that strengthen hair roots and improve the scalp environment. Since these treatments require both time and money, I am worried that I won't see any noticeable results after just one or two sessions.

Has anyone seen their hair thicken or become fuller after receiving hair loss treatments on their scalp or crown? Please share your experiences regarding the typical recommended number of sessions required by clinics to stabilize the sebaceous glands and scalp condition!