There are many people that stuttered and recovered to the point that they haven’t had a block, or haven’t had to use any speech technique for decades. John Harrison is a great example and I highly recommend searching him up! The book Redefining Stuttering is a great book by him! I think the rewiring of our brain happens through anything that betters our self image and/or relaxes us or puts us in the present moment. This could be done through taking assertiveness training, doing a martial art, joining a public speaking club, doing yoga, having a therapist, etc. And for me, as a Christian I believe that just like Jesus calmed the storm in the Bible, God can also calm the storm within our body. I believe that my stuttering is a symptom of panic, and that having stuttering blocks is a learned way to cope with the fear of expressing ourselves. The tension that happens during panic becomes muscle memory, and muscle memory can be replaced by new muscle memory such as relaxation.