My cactus plant is over 10 years old, and it got knocked over today. The top split open but did not break off, and the stem got a little bent. I have uploaded pictures of the damage. I replanted it and tried to give it some support, but I was unsure whether or not I should cut the top off or do something else to help it
I would allow the Cactus to heal naturally. The extra support will help until it is happy in it's new container.
Do not overwater, as this could lead to rot.