Professional speech therapy with an SLP who specializes in stuttering. You can be fluent. I'll always be a stutterer. It's always there. But my fluency is so great that my stuttering is no longer a thought. I was a severe stutterer. Not a single fluent sentence, ever. Blocks that lasted until I ran out of breath. I ran into a young woman at camp this past week who has a stutter when she's stressed. I sat down and talked to her about stuttering. She had no idea I was a stutterer. Greater fluency is achievable. There are a lot of substandard and ineffective speech therapies out there. Just because you've tried and not found fluency, don't take that as fluency isn't achievable. You may not have found the right therapist or program yet.