When i was a kid i was a very very bad stutterer i lived it really bad the kind to shake all the body with bad moves when i was talking. But in my 17s i had a car accident i survived that was miracle so i turned step by step to muslim prayer (i am muslim) and listening the quran but this changed my life and my stutter i started feeling inner peace and i started talking more easy like a knot was untied. So i think that to speak easier it would be good to have inner peace or a kind of serenity in talking. Meditation can help or anything that give you peace. For me it was prayers and quran. I wanted to share this and i hope your problem will be solved.