What is good work to give to a purebred GSD?

by Jennifer
(NJ, USA)

I have a purebred GSD puppy (5 months old) named Jazz. I just want to know what kind of work I could put my puppy to.

I live in the suburbs with a medium-small backyard. I heard that GSDs have a natural need to work or they become restless and destructive. What work can I give a GSD in a small neighborhood?

Also she has extremely high pain tolerance.
I got this puppy from my dad because he had to get rid of it because of that pain tolerance.

He uses an electric fence to keep his dogs from getting off his property. The way this works is the electric fence company installs a wire a foot underground then puts a collar on each dog. The collar will shock the dog after the dog steps outside of the fence.

Jazz had 3 collars on her and she still stepped out of the wire fence. Her sister yelped after just one collar. Even the company owner said that after 13 years of work he has never seen such high pain tolerance.

I'm not sure if this is important but would she be able to work harder? And what kind of work?