The stutterers who I work with who say they have on and off days with stuttering I ask them if they have on and off days walking. I found there is no such thing as on and off stuttering. When I became a fluent speaker I only had good days. This is why a fluent speaker doesn’t stutter. You need to ask yourself what does a fluent speaker do so they don’t stutter. Once I was able to answer this question is when I became a fluent speaker.