False hope is no comfort. Only hard work will help a stutter who has not overcome the affliction by their late teens. This is no opinion but plain facts. Stutterers have my complete empathy. I want to help them find a real solution, not waste their time with idle hope. My strong recommendation, based on decades of experience and reasonable knowledge of the science, is to find a therapy that works for you and give it your all! I gave information on the one that helped me. It’s quite well known and some “famous” people (for whatever that is worth) have gone there, including a news personality.