Zette: There seems to be a lot of buzz in the embedded space with all the IoT hype. I'm not sure if that's translating into jobs, but they're definitely using C and C++.
If you can't find what you want in those spaces, you can still do lots of things in C. For example, most of the underlying software like SQLite, Linux, etc. are written in C, and there are oftenc companies who need contract programmers to help them support their operations. I know that when I used to work in app dev, knowing C and C++ allowed me to show for sure that a bug was in our own software and not in the underlying stack, which is really helpful, and that's something else you could bring to a team.
daverobev: There's still a good bit of FoxPro/xBase demand out there so look into that. It's also not hard to pick up any of the new tech if you've been using their related software. For example, check out Meteor. You should be able to come up to speed quickly there and there are jobs. Your hackety-skills (which you must have if you did FoxPro) will help you tremendously to become a WordPress programmer by just learning PHP and MySQL. Don't worry about the tech stack, just show that you can understand what the customer wants.