I'm a generalist myself. The upswing is that you can probably choose a new career and train up pretty quick, faster if you make a relatively lateral move to a field related to your current one, especially if you can highlight transferable skills built at work. The downswing is you're likely to get bored of any one job eventually.

It's hard to say exactly what fields are transferrable without knowing the specifics of your current career. You can try to find a line of work that presents diverse stimulating problems and rewards generalist thinking. You can always try to fulfill your potential outside of work, since it sounds like the job isn't very taxing. Pick up a productive hobby or start volunteering or get politically active or something. Join an organization devoted to making a positive impact and contribute your time and effort. Maybe identify something you do really well and teach other people how to do it. As a generalist I've done a bit of all of these things, and they all bring some degree of fulfillment, some sense of effectively implementing my potential.