somatic work is a good driver to "implement", for a lack of a better word, neuroplasticity. I've done somatic work with a therapist. We've done exercises, and the main purpose is to call back traumatic moments and rewire your bodies reaction to them. So you start out recalling a negative, traumatic stuttering experience. And you notice how you feel, how your body reacts. What you are feeling. Associate it with colors etc. Then you think about in that moment, what did you need? What would have made you feel better. Then you recall the moment again, but with the "alternate ending" and notice the changes in your body, etc. It was very emotional and powerful. As an aside, I have done 10+ years of acceptance work, cbt work, expanding comfort zone, addressing fears, and voluntary stuttering. But i noticed that my body would still react to certain situations, albeit I was totally comfortable with the stuttering moments and I no longer fear speaking situations. Obvioisly if you spend your whole childhood into adulthood stuttering and associating it with negative thoughts and emotions, your body is going to imprint vertain behaviors into your fight or flight mechanism. Acceptance and cognitive changes can help, but I am really convinced it has to go further than that.