Using a derma roller with minoxidil solution for hair regrowth in the hairline should be done cautiously and under the guidance of a dermatologist. Regarding supplements, it is better to visit a doctor

One of the factors that influence eligibility for a hair transplant includes age. Although there is no strict age limit, the stability of your hair loss pattern should be considered. Typically, hair transplants will be recommended for individuals whose menu of baldness is stabilizing around their late 20’s or older; this gives them a better sense about what the future patterns would look like. Furthermore, overall health, availability of donor hairs and rational expectations surrender to a decision on eligibility.

Taking his age into consideration I can suggest Advance PRP or Regenra

While FUT procedure involves taking a thin strip of skin from the back of the head, the FUE procedure is more minimally invasive as it involves small punches made with 0.7 to 0.8 mm punches in the donor area.

Hair transplant is one of the most effective and commonly chosen options for addressing baldness in the crown area of the scalp. Whether it is the right option for you depends on various factors, including your individual circumstances, preferences, and the extent of your hair loss. Talk to a hair transplant surgeon in your area. You can also opt for non-surgical options for managing hair loss in the crown area, such as medications or low-level laser therapy. 

Hair loss is something that can happen due to several factors. However, the main reasons for this occurrence are the intensity of the hair, the distribution of hairs, the underlying disorders, and genetics. A few symptoms of hair fall include either a bigger size comb or more hair on your clothes that are normally covered in hair and thinning of hair. Assess your diet and get enough rest. Be gentle on your hair using soft hair care products and don't do tight hairstyles. If the problem progresses then ask a dermatologist for help.

At 27 years of age in females, the decision to go in for hair transplantation has to be taken after a proper checkup and trichscopic examination ( microscopic evaluation of scalp along with the hair shafts ). But as an overview you can understand that hair transplant is not done in females for hair fall or generalized thinning but when the thinning has gone to the extent of visible skin showing through the thinning of the hair. Before it reaches this stage of visible loos there are other more conservative methods of treatment and therapies which can be of help and should be tried first. In case the loss is to the extent that at places skin is visible more esp at the place of parting or the front or the middle portion of the head then it is an indication to go for hair transplantation in females.