Cognitive behavorial therapy paired with speech therapy techniques will help to a great extent. You should check out this podcast on spotify or wherever you get your podcasts. “ Stuttering solutions” by Tim Mackesey. It’s probably the most clear and to the point podcast out there regarding stuttering. Really helped me understand the anatomy of a stutter. It is beneficial for a person who stutters to be educated on why you stutter but even more importantly how you stutter. Also if you just search through this sub, people tend to ask the same questions over and over so you can always check out other responses. Lots of good stuff here.