Watch Parry's videos: https://youtu.be/1x4rlucELK0 Read out loud and articulate a little bit exaggerated. Visualize yourself speaking confidently (not necessarily fluently at first because it can be a bit harder to imagine). Check out Elliott Hulse's bioenergetics videos on YouTube, they can also help you to relax your speech muscles. And most importantly communicate with other people, chat up with cashiers, go to a store and look for a specific item, call the store on phone for information, etc. Don't let stuttering isolate you from others.