You seem to be having a female pattern hair loss, and that is the most common type to have. 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 regrow but if it is not happening, you should consider seeing a dematologist.
Further information is in the following weblink
Treatment for few months should add density and make hair thicker. A trcichoscan analysis can be of help but is available at few centres.
Online consultations have such limitations so meet a Dermatologist.