Have you ever done a regimented speech therapy program? I recommend investing in things that can improve your life but I personally would seek our closer and preferably free options. Therapy should be consistent and it's good to find others to fellowship with and hold you accountable so you can reach and maintain your speech goals. Others on this subreddit in the past have provided their experience about the program and I recommend you do a thorough study of any program before moving forward. What are your goals as far as stuttering? Not trying to be negative but there is no such thing as a cure for stuttering. Stuttering is managed, in my opinion, through techniques and the appropriate mindset. I think that having a great mindset about stuttering is attainable but needs to be maintained. Good luck.