OP how old are you? If you are a bit older, such as in your mid twenties or more, I think your stutter may have gone away because you feel fully integrated into society in a way that gives you peace of mind. You’ve faced all the main fears you’ve had to face, such as applying for a job, and learning to fit in with adults, etc. etc. So your anxiety decreased a lot, and thus the stuttering too. Does this make sense?