I think this is a reasonable step to take at any time in your career. Many people take time out or have several careers in one lifetime! I don't think management is for everyone and you've given it a good go. Enjoy your classroom work & stay put. There is no reason to become a manager. If you love teaching and keep learning that will be enough of reward. Don't worry about the future and if you change your mind just go for it. Who knows what tomorrow holds for any of us! Live for today, enjoy your teaching and any Head would snap you up, if you are excellent at what you do.