Query regarding my ivf treatment. Help?

I'm currently on ivf treatment and underwent egg retrieval procedure on july month and was prescribed estrogen medication since then. But my uterine lining thickness is not good. It's not growing more than 6mm even after estrogen medicine intake and so fet is getting delayed. Since it didn't work, now I'm taking letrozole 2.5mg since day2 of my current cycle and will be taking this medicine till day7. Will this current medication help improve my endometrial thickness? Before ivf, I had iui and I conceived, but unfortunately I miscarried during my 2nd month and underwent d&c. After that, I had one round of hysteroscopy to treat uterine septum. Is there any possibility that D&C and hysteroscopy could have done some damage to my uterus? If so, then how can I recover from this? Will the current medication cycle with letrozole help? Kindly provide your suggestions.