Decide what it is you want to do. Easier said than done, I know. I've met people who've taken the Myers-Briggs, DISC, and all sorts of other assessments. Sometimes they work, sometimes they don't seem to. I like the simplicity and practicality of O*Net Interest Profiler.
But it isn't as easy as waving a magic wand and getting the answer. You'll need to test the answers by talking with people in that industry and career. Charting A New Career Course by Susan Joyce provides recommendations on how to evaluate a new career choice.
Once you've narrowed your options down and pinpointed the right direction, it is crucial that you begin to "connect the dots" for people. You are responsible for conveying the connection of transferable skills. To learn how to do this, read Networking for Career Changer and "Renaissance Personalities"
Here are some interesting posts about "connecting the dots"
Have you changed industries or careers? How did you do it?