The hair cycle normally consists of growing, resting and falling hairs and there is a delicate balance between these stages of hair cycle. Normally hair should re-grow but if it is not happening, you should consider seeing a dermatologist. Further information is in the following weblink https://www.aad.org/public/diseases/hair-and-scalp-problems/hair-loss

Hi. You may be suffering from early onset androgenetic alopecia. Could you send your pictures on follow up chat?! Apart from being genetically predisposed to balding,  environmental factors , pollution, stress, junk food and poor diet could cause you to lose hair further. You'll probably need treatment with hair care lotions or serums - something that has vasodilator properties and improves thickness of hair and reduces hair loss. Have a good balanced nutritious diet. Your hair density can be restored if you take timely treatment and care of your hair. Prp therapy is possibly a good treatment option.. See a dermatologist near you. Hope this helps. Let me know if you need any further assistance in this regard. Warm regards. Dr Govind S Mittal.