I recommend trying the Dave McGuire Program. They even have a self help book you can purchase on Amazon for about 10 dollars, called “Beyond Stammering, the Sport of Speaking.” It’s really a wholistic method that helps you become more powerful with your personality, while also giving you a breathing technique for feared words. Other than the breathing, it allows a fully natural way of speaking and even encourages speaking with natural intonation and hitting each syllable with a natural level of strength. It requires courage but the method can hold up in feared situations if you commit to it. I would check it out man