Identifying your comprehensive portfolio of skills, knowledge and experience can often only be done with an objective party talking with you about your likes and dislikes and experiences in life. Asking you the hard questions.
Ultimately thinking outside the square. Knowing how to use your contacts and any network you have or might have forgotten about, and then developing and preparing for interview, if what you choose to pursue is quite different to your current career direction.
Identifying why you did not pursue a career that you had always been interested in might be a simple matter of understanding that you now have the skills, acquired from another sector.