I adore your gut to step up and take a chance to improve your career when you realize that there are no more promotions coming your way. Not having rooms to move forward in your career could be killing your desire to work and draining your energy on things you are no longer happy to do. If your new interest require some years of related experiences, you could always give it a try as you do have something that the new graduates don’t have which is the industries experiences. If the qualification is something you could try to get in acceptable time frame, you could do it as well. Or if you can provide some of your previous appraisal on how you can adapt to new job or new field, you can always show them to your potential employers. Try to market yourself according to what they are looking for.