What are my options to shorten/fix my elongated gluteal fold/crease after BBL? (Photos)

Little section of the intersection between the lower buttocks and the back of the thigh is tricky business and it’s better to leave this area alone as much as possible.
Fat grafting to restore previously removed fat tends to not work very well and usually requires multiple rounds.
I think it’s going to be difficult to get you a significant shape especially if you don’t want skin excision.
In the end you may want to leave it like it is and except the more surgery may not get you what you want.
This is an area I am particularly cautious about and generally not recommend having a liposuction in. Most commonly it’s done for fullness of the upper back of the thigh sometimes called the banana roll.
It rarely turns out the way patients want
Best, 
Mats Hagstrom MD