I'm curious about the effectiveness and satisfaction level of hair loss treatments!

Lately, I have been under a lot of stress because the hair on the crown of my head has become noticeably thinner and seems to be thinning overall.

It seems like just changing shampoo or taking supplements has its limits,
I am seriously considering professional hair loss treatment at a hospital.
I looked it up online and found that there are much more varieties than I thought, such as scalp injections, exosomes, and hair follicle injections.
I am most curious about whether I can actually see tangible effects, such as hair becoming thicker or new hair growing, when I receive this hair loss treatment.
Since it involves both cost and time, I would like to know the honest reviews regarding the overall satisfaction level of those who have actually undergone the procedure. I am concerned about whether the changes are worth the price, or if my skin will quickly return to its original state if I stop the treatment.
Since everyone's scalp condition is different, I am also curious about which scalp type or early stage of hair loss this treatment is usually most effective for.
I would appreciate detailed advice from those with experience or experts regarding the level of pain involved in hair loss treatments and how many repeated sessions are typically required to achieve high patient satisfaction.