Allow me to answer your question as best i can based upon your photos. However, please keep in mind that an in-person, or at least a virtual, consultation with physical exam is first necessary before any legitimate evaluation or final surgical recommendations can be made. If you are open to having your buttock augmented as well, then the best solution may be buttock implants to pop out that “indentation”. There are currently only two FDA approved surgical options for augmenting the buttock/hip area: 1) Buttock Implants (which are soft semi-solid silicone rubber implants that cannot rupture &/or leak) and 2) Brazilian Butt Lift (aka BBL) - which utilizes the patients own fat from liposuction then transfers this fat into the buttock. On the other hand, BBL using fillers such as hyaluronic acids, Sculptra, etc… is a dangerous, guaranteed waste of money, and is NOT FDA approved. Additionally, any physician promoting “biostimulators” for buttock enhancement is just a joke, and any board certified plastic surgeon promoting such, should not be trusted with your butt. So what it comes down to, like any surgery, is proper patient selection and long-term results. Implants provide the only guarantee for a sustained permanent result and tend to be ideal for perking up not only lean or deflated buttocks but also providing substantial projection to any buttock and many buttock deformations/malformations. Based upon your photos, a Stanton Anatomic®️ shape buttock implant may serve you best. Unfortunately, BBL fat tends to survive quite unreliably in indentations like yours. A large part of the reason is these indentations usually have some level of scar tissue (aka fibrosis) and/or fat and skin atrophy associated them. So, if you're looking for a reliable, predictable, and long-term permanent option that also provides projection in the upper, central and lower buttock and hips, buttock implants are your solution. Procedures marketed as “supercharged BBL” or “hybrid BBL” that add fat at the same time of implants are simply marketing ploys. Fat that is added at the same time as a buttock implant is doomed to melt away 90+ percent. Thereby rendering it completely useless. The reality is, when buttock implants are properly placed 100% intramuscular (i.e. surgically and precisely positioned within the gluteus muscles, not subfascial and not dual-plane and not on top of the muscles), there is absolutely no need for fat transfer. Please note that an extremely few number of board certified plastic surgeons specialize in buttock or hip implants, so you may need to travel far and away from home to find this particular surgeon. Getting it done right the first time around is not only the best chance for success, but also will save you from a lot of headaches and money in the future. Glad to help.