What would be best for my jawline fat since Morpheus 8 didn't help - Kybella or other? (photos)

Thanks for your question.  Judging from the photos alone, it does not look like you have a lot of fat in the submental area.  Go see a board certified plastic surgeon, and they can make the determination whether or not there is treatable fat in this area.  Your surgeon may recommend cool sculpting, Kybella, liposuction, topical treatments, or nothing!  Best of luck to you.

From the photos you posted, I do not feel you need  (or should) do anything more at this time. You have a relatively straight jawline without any jowling, there is no neck banding and no fat pockets under the jaw on the neck. It appears you got a good result and look great! There are many procedures to improve the neck and jawline, but the goal should always be a natural appearance. You must also have a realistic expectations. Please discuss your concerns with your surgeon.