What's the best way to get a bigger butt?

Fat injections are a reliable way to enhance and shape the butt.  Liposuction is used to harvest the fat and shape the area then the fat is carefully prepared and injected into the areas where volume is needed. 

Hello dear!
Thanks for the question and provided information as well.
The best way to get a larger, more beautiful heart shape buttocks is with a BBL.
In general, you need to be physically healthy and at a stable weight, have realistic expectations, be a non-smoker and your BMI needs to be 30 or less.
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 :)