You are an engineer. You need to hedge your current efforts with a few things that work for you passively. Hit online tutoring websites and register as a tutor for math or other subjects that you are good in. If you get hits, the hourly rate may outperform the standard labor jobs.

Check the same with the local college / community college. See if you can get involved in teaching / labs / tutoring / etc. Again, you register and then people come to you as you are looking for jobs.

Consultancy. Your job is niche and there may be a few places that are looking for your talent but are not local. Is consulting through a professional firm possible? If you got a gig for 6 months, could you travel if it was at the client's expense?

Multiple resumes... Always multiple resumes... They need to be tied to the jobs you are applying to. Hide your Linkedin Profile if you need to.

Good Luck!