Every morning I run 1 mile, read 10 pages out loud of a book and chew gum when I have to talk to people. This has cured about 90% of my stutter. Not saying this will work for everyone but it has for me. The days I do not run or read, it is extremely noticeable in my speech. I have also noticed that if I drink alcohol or smoke weed , the next day my speech is hindered. So of course, if I know I’ll have to communicate the next day I try to avoid the substances. I doubt this will work for everyone but it’s a necessity for my life now.