The area that started to crease is going to be a problem. You can get most of the dent pulled by suction cup and/or working behind the panel, but the uppermost crease will require a little more than that. I've had reasonable success with soft tools, like a clean (i.e., brand new) medium durometer rubber mallet and a soft wood block behind the panel as a dolly. The results are never perfect, but it's fairly impressive for a quick massaging out of larger dents. Short of working it with a dolly, spot weld puller, and grind/prime/paint, that's about as good as it will get.