Electrical/plumbing is a great idea. The ultimate job I think is robot repairman, because by the time that is automated we're all screwed anyway. But consider

Electrical/plumbing is a great idea. The ultimate job I think is robot repairman, because by the time that is automated we're all screwed anyway. But consider exercise. Society automated a lot of manual labor and people still need to exercise, even though it's a blatantly wasteful use of energy. It's even more inefficient than digging holes and filling them again, because it's not even good for the soil. But it's important for people to do it.