Well, my “narrow” specialty is software engineering. I’m putting narrow under quotes since it’s a very wide field itself. There are many specializations within the field but having an interest in a specific domain is what’s really important. It’s quite easy to switch between specializations given the opportunity.

Moving up on the abstraction ladder, software engineering is one manifestation of systems thinking. Meaning designing and modifying complex systems consisting of machines and humans. This mindset is applicable other areas, really anything that has a “network” in the description - cargo logistics, public transportation, electrical grids, telecommunications.
Even law to some extent. I’m only half joking when I say programming made it easier for me to understand the legal system.

Unfortunately I don’t think anyone has a categorized list of possible options. Anecdotally some groupings I’ve noticed:

• Manual service jobs (sure hairdresser and cook are very different jobs but somehow the jump between them is not so huge)
• Caring about and improving other humans (teachers, therapists, nurses, coaches, both physical and mental)
• Physical violence (military, police, mercenary, criminal. Ideally for protecting others, but the line is very thin be careful here)
• Medicine (once you go there there’s no going back, incl veterinarians)
• Agriculture (raising cows and planting corn is very different, but due to cultural and practical grouping switching between the two is easier)
• Art. Regardless of the preferred medium it’s all very fluid. For example creating a sculpture after a few years of being a musician will surprise nobody.