There are many different therapies and the skill levels of therapists themselves can vary. It's always worth having a conversation with professionals in this field. Things change. Techniques improve. And your own willingness and drive changes. And you need to remember a therapist just helps guide your own effort. A therapist isn't going to hand you a magic pill or a simple trick that makes you fluent. You need to put the work in, usually lots of work, with drive and commitment. And progress is slow and often involve big changes in attitudes. Are you ready to reassess and change many big things about your life and how you speak and are you willing to spend weeks of hard work trying to make changes in your life? That's the real question to be asked.