Risks of doing a second FUT into new areas of my head only 9 months after the first FUT?

Dear navid.amini,
Thank you for posting this question. A majority of the hair from your first transplant has grown out at this point, so it’s perfectly fine to undergo a 2nd FUT at 9 months. As an aside, the International Society of Hair Restoration Surgery maintains that FUT is the Gold Standard when it comes to surgical hair restoration. FUE is a specialty method, of this the singular advantage is that it does not leave a linear scar in the donor area, which is hardly a concern to people who wear their hair longer than a military high-and-tight. Since you have already had an FUT, and have a linear scar, the logic behind undergoing an FUE isn’t there. I hope this information is helpful to you.
Kind Regards,
Ken Anderson, MD, FISHRS

You can safely have another hair transplant surgery as long as the prior results have grown and your scalp is back to normal.   There is no "absolute" time frame.  It is best to see a doctor for an examination.

The time schedule of 9 months post-op to repeat an FUE is ok -into new areas. Your surgeon will be very careful, I'm sure, not to over harvest and thin out your donor hair area too much.