Have you tried speaking with earplugs? Works for some people. Sometimes hearing our voice causes the stutter. Ear plugs cause you to hear your voice a little muffled. Might only work temporarily, but it also is good to feel yourself getting through sentences. Also this sounds weird but have you ever instead of trying to speak normal just stutter on purpose. By stuttering on purpose you’re not trying so hard to speak normal which is the cause of stuttering in the first place. If you are already having a difficult time normally then this can’t hurt right? Good luck