I stuttered from like 1st grade until senior year. What helped me was reading out loud to myself and to my speech therapist Mrs Olson. What might help since reading by yourself is not as stressful as reading to like, a group; you could read into a microphone. Maybe act like you’re recording an audiobook or recording a podcast for more genuine conversation. The more I talked out loud in a safe space, the more it helped me. I’m 30 now and I barely ever stutter, so you can get over it, it is possible, I promise.