Find a start-up CEO, a job, and keep working on it (Score 2, Insightful)

You've 30 years experience, been in several start-ups, and remain clueless about what's next. So you are clearly not the one to drive a new company. Make a "short list" of people you know who were principals of the previous start-ups - people you respect for their business knowledge and accomplishments. Ask them for advice. Do have a working prototype of the invention? Have you done a patent search to see if your invention is novel? If I were you, while I was doing this, I would get a day job, unrelated to your invention, and spend my spare time writing some software (your field) to go with your prototype.