I’ve been doing metronome training for about 7 weeks now and have seen no improvements in my fluency whatsoever. I like doing it though because when I read out loud to a metronome, I feel fluent and it brings me back memories of how my speech used to be when I was younger. In regards to Nofap, I’ve been practicing it for a while and it has not helped my speech whatsoever either, but it has definitely helped with my anxiety that comes with having a speech impediment. Many people on there though say it has helped reduce or even “cure” their stutter. Nonetheless, you should definitely try it out