What actually helped me improve my speech the most was the day when i stopped caring much and didnt let it define me anymore. Nervousness makes your speech much worse and if you step into every converstaion thinking of your stutter you will stutter a lot more than u naturally do. You also need to accept is that there is no cure and considering the fact that stuttering is such a complex speech disorder and can be caused by so many different reasons.. there may never be one. I know the whole "be brave" thing might sound cliche but in a stutterers case being calm and patient with yourself actually does help A LOT.