From my experience, here’s what you can do to help get out of this stuttering rut: Avoid melatonin or any testosterone-boosting supplements. Avoid eating carb-heavy meals at night. If you’re not exercising and eating healthy, now is a good time to start. Do cardio, resistance training, and eat fruits and vegetables (you need the magnesium). Buy L-theanine and choline supplements. Trust me, you need them. Start doing 10 minutes (or more) of mindfulness meditation. Check YouTube or download the Sadhguru app. This will help you learn to be present—it’s critical to disconnect from past speaking experiences. Since you've done speech therapy, go back to practicing speech drills. Do tongue twisters daily. Let me know if this helps you get out of your stuttering rut.