I've written about Barbara Sher before. She really is one of a kind. She has the uncanny ability to actually see the world, people and events as they are and extract workable solutions to all sorts of everyday challenges. She's an original thinker and I really appreciate that.
This book, I Could Do Anything if I Only Knew What it Was, is exactly about that--about when you have no idea what you want to do, and how you can find out and get doing it.
Basically she says when one does not know what one wants to do it's because there is an inner conflict going on. So, you discover the conflict, discover what you really do want to do, and get going on doing it.
She leads you through various exercises and questions and leads you to discover what it is that you really want to do.