What treatment would you recommend to lift/shorten my buttocks? (photos)

Sculptra would certainly assist with lifting and raising your gluteal fold. You could then combine this with Emsculpt to define the muscle. This will further enhance the lifting. You may experience some growth or projection with these procedures, but you will achieve the lift or elevation that you are requesting.
J Scaljon

Dear ECNAS,
it is hard to tell for sure without an examination. If you are considering surgery, I would suggest you consult a board-certified plastic surgeon. Only after a thorough examination, you will get more information and recommendations.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Yu need hip dip fillers since you are so limited in fat stores. Expect at least 40-60 vial/syringes of either products with fees in the $20,000+++ ranges. Best to seek virtual consultations.