Still not flat 6 months after tummy tuck - how can I get this flat? (photos)

Your abdomen looks protruding because your muscle is very loose and allows the cavity organs to protrude.
In my opinion you will need to do a tight and wide muscle repair, in my hands would be about 6-7 inches. But you must understand our muscle is literally a steak and the muscle will not remain tight and flat forever, unless you really work out your muscle to maintain the tightness. And weight gain is your enemy having in mind, your genetics is to develop protruding appearance.
Be encouraged.
Dr. Cárdenas

It is very difficult to give you good advise based on these photos only. There are two aspects of abdominal bulge (prominence); intraabdominal fat around organs that is pushing abdominal wall, unavailale to liposuction and, superficial fat, above the abdominal muscles, that could be removed and shaped with additional liposuction. In short, weight loss (abdominal fat) and additional liposuction of abdomen and flanks, may create significant improvement. In person, second opinion consultation with a board certified plastic surgeon with good reputation in body contouring surgery, is recommended. Good luck.