Do you have any contacts that would enable you to develop a business related to your background?

I’ve had aviation related businesses (plane and helicopter leasebacks, consulting, etc.) which worked out well because of my contacts in the
field–however, this was not the primary source of my income–so that is also a consideration, because of the risk involved.

Others have given excellent feedback, and I’m sure you’ll get more. Just be careful not to act in desperation. Depending on your financial situation, perhaps taking another “day job” might be wise until your path for change is clear. Also, have you considered franchise options?