Saggy BBL - What can I do to improve this condition? I really don’r want to go under the knife for it again.

I would suggest doing squats or exercise that will lift the buttocks if you do not want to go under the knife.

Require before and after photos, data regarding amount of fat harvested and injected, type, and duration of wear of compression garment, weight fluctuations, and general health to comment on path ahead.Kenneth Hughes, MD, ABPS Board Certified Plastic Surgeon
Los Angeles, CA

Dear atvxx27,
I understand your concern. However, without a proper assessment it would be difficult to determine what is wrong. It is best that you visit your plastic surgeon for further assessment. Only after thorough examination you can get proper recommendations and advice.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

You are still in the early stages of recovery at 3 months out.  However, it is normal for some of the fat that was injected to resorb or die off. Please wait until around 6 months to consider a revision and go see a board certified plastic surgeon.Providing photos would be helpful and would allow me to give you a more thorough answer. Best of luck!

Thank you for your question. To provide a valid medical opinion I will need to see pictures of you body from different angles. I would suggest to be treated by board certified plastic surgeon with experience in this procedure, to get the best desired results.
Respectfully,Dr. Emmanuel Mallol Cotes.-

Thanks for posting your question. The fat transferred to your buttocks can shrink with weight loss. You can try to increase the volume of your gluteal muscles by doing squats and working  with weights. 

Hello dear!!
Thanks for the question and provided information as well. 
Unfortunately, without pictures, it is very difficult to give you a proper answer. l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)

Did you lose weight recently or after the surgery? This can lead to volume loss 1 year or more after your fat transfer. It is hard to give you any more specific advice without seeing photos. 

Without seeing any photos it is hard to give a recommendation. Of course certain workouts will help to increase and maximize your results if going under the knife again isn't what you want to do.Best Wishes!

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Respectfully,
Arian Mowlavi MD, FACS
Realself 100 Hall of Fame Inductee