Substitutions help me a lot. Beyond that, i don’t stutter if I’m yellow or “pretending” to talk in an accent different from my own. My stutter and silent blocks are HELLISH when i speak with my own natural voice, but when I’m trying to sound slightly more southern or make mock some voice, i will not stutter. I use both of them in my job as a teacher. I didn’t think i would make it this far. Another thing that really helped was Performance Avoidance Goals when taking a Public Speaking class in high school. I held myself to a 100 GPA standard for the last 2 years of high school and scared myself straight into not stuttering. The pressure of my grades being shit was way scarier than my stuttering.