Stuttering is a neurological condition. I can tell you with a high degree of certainty that more than 99 percent of stutterers had a stutter before and after Covid/masturbating/vaccinations. Even If indeed you would have stopped stuttering if you didn’t get vaccinations, get covid, and start masturbating, it still would not be the reason you stopped stuttering. We can find coincidences if we look anywhere. Don’t get caught up in things that can be used like elf on the shelf for little kids. Especially with the masturbation thing. That is normal and healthy (and it’s a personal thing for you to decide what to do). It will not fix or make your stutter worse. Cheers mate!