Thoughts on how to fix a depression in the roof

I read the entire thread. I agree that with yours that it could just be popped out. Creased panels like mine cannot be manipulated with the rods and levers of Paintless dent repair. I would love to know what kinds of magnets you have. I will try anything not to replace my roof.
I bought mine about 12 years ago but they are similar to these:

Warning Flag 80-lb. Cup Magnet with Hardware