How can I make my butt crack higher?

It is very difficult to determine the exact size and shape implant you will require to best match your ideal butt image without an examination by a board certified plastic surgeon. Not just any board certified plastic surgeon, but one with many years of frequently performing breast augmentation surgery including different approaches, techniques and implant choices. This is because several measurements not to mention your breast characteristics are needed to determine the optimal implant size to obtain your goals. Without knowing these dimensions it would be difficult to make this determination. For example, the existing base width of your buttock will determine, in many cases, the maximal volume per implant profile that you can accommodate. Liposuction of your lower back and fat transfer is also helpful as an adjunct to implants. Using “want to be” photos however are useful if simply provided to the surgeon.

Without photos posted, it is hard to say. I know that with my weight loss patients, their buttock tend to sag and needed to be lifted. This does raise the buttock cleft as well.

Hi
Thanks for your questions.
Buttock augmentation is achievable either by fat transfer (Brazilian Butt Lift) or gluteal implants. The choice would depend on the individual patient's  anatomy which determines what part of the gluteal region to focus the augmentation and what material to use.
Unfortunately your question requires a precise anatomic evaluation so it likely can only be answered with an in-person exam. If you would post photos that may also help.
Thank you...