I think my stutter could have been overcome, or at least improved dramatically, with very early intervention as a kid. Unfortunately, that's not how my parents rolled. I'm 53 now and resigned to just dealing with it, more or less. I tried speech therapy around 19-ish and then again a few years ago, but the results for both were the same. No improvement. Naturally, I tried everything else in-between, from breathing techniques to OTC interventions. I remain a positive, ambitious person. I have a very good life because I'm constantly trying to improve in all areas. It makes life worth living, as does having a wonderful wife and three daughters. I also get to pursue work I'm passionate about, along with work I'm not so passionate about, but can still find joys in. I tend to be quite introspective and I do like to look at things as scientifically and logically as possible. Stuttering/dysfluency is a spectrum, and, much like cancer, has many causes and contributors. There's no one solution. There never will be. There may be a cure one day if there's some foundational cause that can fix x% of cases, but it's not something we can count on. Unfortunately, I'm one of those stutters who gets hard blocks. I'd much rather be a stutterer who simply repeats words or sounds or whatever, but that's not saying much. It frustrates me at my day job and has kept me from pretty significant opportunities in the past, but again, I simply have to, and do, keep on pushing ahead. I'm in control of my own ship, so to speak, and if I occasionally have to take a detour or reroute, so be it. I'm still going to live my best possible life. As you continue to seek your own answers/solutions, keep on pushing ahead regardless of if you're able to improve in that one area or not. It's the only reasonable way to get the most out of life.