While speech therapy can really help, I think confidence and routine helps more. Having 3 hours to dedicate to that sounds like you really planned your days and had a level of consistency that most people never have. Maybe you need to think of other ways to center yourself regularly that better fit your life. Also, 3 hours a day of anything is kind of nuts long term, I think once you get passed 10-20 focused minutes a whole lot the the non-meditative use case for speech therapy is going to really drop off.