If that trick stops helping, don’t feel hopeless, bc that is common with tricks that do not get to the root. The root is that trying to hide your stutter causes bigger blocks! Try adding a voluntary stutter. You can call a store right now and say “I hhhave a question. What. Time. Will. your store be closing today? Starting slowly with very distinct enunciation tricks your brain into not feeling shame (by allowing your voice to take up space and time). Also, notice if your whole body moves in a speedy/panicky way. If it ever does, slow down on micro-tasks (opening doors, walking down a hallway, putting pants on, etc)