Our 73 dart

So after my daughter got most of the bondo out of the driver side rear qtr panel we Discovered this beauty. Not sure what was done here looks like someone tried to fill a fold with weld? Or maybe they replaced the quarter and then it was hit again not sure. I’m not sure what our next route will be. Don’t want to fill it with bondo. Tried banging out from back side but with them at weld there doesn’t do much. Also a little lower down the metal seems warped if pushed on it pops in and out. 61A93584-CC80-4D91-AA2C-98AC69EA15B4.jpeg