Is there a way to fix stuttering with a certain word (hypnosis for ex.)?

Is there a way to fix stuttering with a certain word (hypnosis for ex.)? Hi guys. I'm 18 years old and I started stuttering 2 years ago. My stuttering has been mainly caused by my low self-esteem, insecurety, stress and the fact that both of my parents have also had stuttering problems (my brother has never had any problem though). In these 2 years, I've improved myself a lot but I still have a huge problem with a particular word: "non" (which is the italian translation of "not"). I guess that you can understand that it's pretty frustrating because whenever I want to say a sentence with the negative form, I stutter. What could I do to fix, or at least try to fix, this problem? Few months ago I read on this subreddit that hypnosis may work.. What would you recommend me to do? Thanks. Edit: what I've tried in these 2 years are: psychotherapy (which has helped me quite a bit) and an intensive course that I paid 2000€ which should have given me a method to fix stuttering (hasn't helped me at all).