There could be many reasons as why do you have so thin hair. It could be understood only after the examination by an expert surgeon. There are various solutions to this. Depending upon the situation the surgeon will be able to tell you what will be the right solution
Fillers basically help you to give you a youthful look and make you look more presentable. Suggesting anything just on the based of the image would not be possible. You can visit Artius Clinic at Kharghar and get consulted.