From my own point of view, you basically keep putting yourself out there in new social situations and opportunities where you will have to speak. So, you could join a club, start ordering food, chat with someone in the hallway, give an old friend a call. As a stutterer, I always have a gut response to not respond or to avoid situations like that, but at least for me personally, the more I do them, the less scary it is and the easier it is for me to communicate.