The best thing I did was trying to take more pauses when I speak and slow down my speech, and tried to really think through what I'm trying to say. Another thing that helped is trying to speak in a kind of rhythm. So like to a song as I found I stuttered less. So if you are struggling think of a beat in your head, that's what I did. I started reading Shakespeare out loud on my own and it has a certain rhythm to the way its laid out and that helped me. Also being on strong anti anxiety medication has helped as I have major mental health problems. That brings me to the best thing you can do. Speak to an expert. Don't look for solutions online. I'm not sure where you live, but try to find help from people who know what they are talking about.