Misfire, Have you read "The Purpose Driven Life?" It has some guidance about finding your purpose, that seem applicable to finding your career.
The most logical career guidance I've heard is to list your desires, your experience, and your abilities on a piece of paper then use that to find a career that combines all you have to offer.
At midlife, the experiences and abilities may be a longer list, but if it does not match up with your desires, maybe it's time to change careers even if it takes retraining.

Just a thought.
smile