When you punch a dent into a piece of metal, an equal volume of metal will be raised around it.
If you do it carefully, you can drive a wave of metal toward the low spot.
Start by punching about 3/8" or more away from the spot you want to fill.
Aim the punch towards to spot that you want to fill by making it maybe 20 degrees from perpendicular to the deck.
After the first punch make one to the left and one to the right by about 1/8" to make a trough like you see between two waves.
Next punch the wall of the trough over to the gouge.
If you have something very flat, you can see how much it bulges.
Resist the temptation to file down the bulge to see if it will clean up.
Instead, beat down the bulge with something flat, then file it flat.
This is a common way to repair very large molds and dies weighing many tons (sometimes valued in the $millions) when they are in the press and cannot be welded.