If you haven't done so, find a good speech pathologist in your area. Someone trained in assisting stutterers. In my experience, there is a world of difference between a professional and what the public schools provided. The key for me was putting in the work. It took me two attempts. When I received help in my teens, I didn't put in the work. As such, I didn't improve. When I returned to speech therapy in my 20's, I made rapid improvement. The program was the same, the difference was me. I did my homework. I practiced every day. I like to use the analogy of going to the gym. If you only work out an hour a week, you won't see any gains. But if you work at it every day, you see results pretty quickly. I've read hundreds of different stories in this forum. I appreciate that there isn't a one-size-fits-all solution. I hope you find a solution that works for you.