Maybe using TDCS it can go better. There are some studyies that confirm this technique. A guy in reddit had done it. [https://www.reddit.com/r/tDCS/comments/99f5bn/my\_experience\_using\_tdcs\_to\_treat\_stuttering/](https://www.reddit.com/r/tDCS/comments/99f5bn/my_experience_using_tdcs_to_treat_stuttering/) [https://discovery.ucl.ac.uk/id/eprint/10073581/](https://discovery.ucl.ac.uk/id/eprint/10073581/) [https://pubmed.ncbi.nlm.nih.gov/30379387/](https://pubmed.ncbi.nlm.nih.gov/30379387/)