All you need to do is to sit in a chair in a quiet room and just breathe. No blowing. Just breathe as though you are getting ready to sleep. Easy and smooth airflow. Next time watch a fluent person speak. As you become comfortable in your breathing then you add voice. You can say a vowel sound as you breathe normally. The purpose of this exercise is to talk as though you are fluent. The same way fluent people speak. You want this to become your new normal. Once you begin stuttering then you stop using voice until you feel very comfortable in your breathing and speaking. No techniques or strategies. You are just getting your brain to understand why fluent speakers don’t stutter. I hope this helps you. I sometimes forget sometimes that I ever stuttered. Good luck.