You're absolutely right, the techniques for each kind are different. Voluntary repetition actually helps a lot when we are in a phase(?) which we have a blocking error in our speech system (vocal cords or diaphragm). This will help us a lot to speak. As we all know, we have so many phases of stuttering and each will need a different technique for each of them! I'm really happy to hear you passed this phase after lots of practice 🙌