7 months post FUE hair transplant. What can I do to improve hair density? (photos)

Hello I had a FUE hair transplant 7 months ago, the doctor implanted 1800 grafts in my frontal area. However I'm noticing the density is not what I had in mind, is too thin. So thin I still can look through the hair and see the scalp. 1 month after the procedure the doctor inyected me in the scalp dutasteride. Is there something I can do to improve the density? (Besides another surgery, this has been suggested already by my doctor, but im suspecting he only wants that because of money).