I’ve beat my stuttering through exactly that (Neuroplasticity). I rewired my brain to hear fluency coming out of my mouth. I also exposed myself to pressured situations with a plan of action of course. I was also a severe stutter would block on 80% of words, repeats, and make facial grimaces. If you want a better idea you can DM me and I’ll give you exactly what helped me overcome my stutter and could possibly help you overcome yours