Your best bet would be to bin the motor, and get a new one fitted, you will never get it true, and it will now be out of balance, & wobble the prop all over, & vibrate it.

I bent a motor shaft on one of my electrics a few months back, just binned it & fitted a new one.
Brushed motors are cheap enough anyway, but if it was an expensive brushless type, then it may be worth salvaging and have a new shaft put in.
Most cheap motors are sealed, and have non replaceable parts, you can't get parts for them anyway I don't think, except for the expensive type.