I hate recommending this to people but this is what really really helps me. Try get any benzodiazepines. They really really help me. When I’m on 2mg-3mg of them, my stutter is basically completely gone. They completely relax you, make you feel confident in yourself and you forget about stammering. I have blocks, it’s a different type of stammering.. I rarely ever repeat the same letters for example (t,t,t, today) mine is normally t—-day)