I get your intentions are good and I'm not trying to sound too high horse'y here but This is kinda like the equivalent of saying to a poor person "you aren't rich because you didn't want it bad enough". Some people have disadvantages in life, some people overcome those disadvantages, others don't. People don't need to feel like a failure because of their disadvantages. We all should work on improving our stutters for our own sake. But we should also accept ourselves as we are in this moment and fuck anyone else who doesn't. Stutters aren't curable, they can be improved to be somewhat unnoticeable in some people but not cured. Coming from me as a person who's greatly improved their stutter over their life and has a great career/family. Living with a stutter is difficult enough without people being told they're less then for not always being a beacon of perseverance and acknowledging their stutter has held them back in parts through no fault of their own.