Any tips from people who have completely gotten rid of their stutter?

Any tips from people who have completely gotten rid of their stutter? I’m 16 y/o, I’ve had a stutter as long as I can remember and it’s always been pretty bad, but in recent months it’s gotten much, much worse. My case of stuttering is a he most severe I’ve ever seen and I’ve been researching the most severe cases I could find for a few hours. I went to an intensive speech therapy program for 3 weeks in the summer of 2018 and I got rid of my stutter almost completely. However without a few months it returned. My question is for anyone who has completely gotten rid of their stutter is how bad was your stutter, how did you get rid of it, and how did you retain your fluency? I’m willing to do anything and everything to get rid of my stutter at this point as it’s severely impacting my social and academic life. Any help is appreciated.