How far a person with stammer can improve theyself to speak like a fluently person?

How far a person with stammer can improve theyself to speak like a fluently person? I don't care how much effort do I need to put in it and I will never agree with this bullshit of self aceptance, if I have the chance to change it I will! I just wanna know how far can I improve my stammer to speak like a normal person do, how are the chances of I get ride of it, and which are the things I should do to achieve it in the most efficient way. I'm just tired of leting the stammer ruin every aspect of my life and I will do something about it.