If you haven't done so lately, it's time to inspect your "why".  Why do you teach?  Why are/aren't you happy?  Why are your kids learning/not learning?  Why are you successful/not successful?  These kinds of questions are important because they help you self-reflect on your own motives, needs, and process.  The answers in-turn allow you to better understand yourself, set goals, and improve where necessary.  If you aren't at your best, neither will your students.