For me a couple of years ago I did MDMA and shrooms a couple of days apart, and I had 100% fluency for the next 2 weeks. Was a really weird, but great, experience. Then it slowly faded over the next 60 days. Stuttering for me has a large basis around who I'm around, etc. and can be a little random. Like some days I barely stutter at all, and others I do much more. So maybe that has something to do with it. Either way, I'm thinking about trying microdosing soon to see if that has any potential long-term upside. Not looking for a cure per se, but even an alleviation.