It can be worked on. Mine is by no means cured but as of late it is no where’s near as bad as what it used to be. Best thing to do is stay healthy and take care of yourself in every meaning. Sleep well, eat well, workout, meditate, take time to yourself, do things you enjoy. Everything. When you feel good you feel confident when you’re confident you don’t stutter as much. Also I have found personally that CBD has done wonders for me before I really did any of that stuff for myself. And I have also heard anecdotal evidence that psilocybin mushrooms whether that’s microdose or full dose can cure it although I have not experienced it.