I second the seclusion idea. We cannot be trusted with distractions. Remove them and you won’t have to resist or use will power. Speaking of will power, we don’t have as much as others. I’ve found routines are my lifeline. Each task or step has to complete near the beginning of the next one. The closer the better, so there is as little time for a distraction to interfere with the flow. One last thing, it doesn’t get better or worse. You ability to cope gets better or worse. We have ADHD, you don’t grow out of it any more than a person with a missing hand (an an extreme example) grows out of it. They work around it. They can’t use both hands, because they don’t have two hands. We have our personal ADHD symptoms that won’t go away. Our only way forward is to identify them, accept them, and then work on ways to mitigate them. You wouldn’t fault a one handed man for not being able to clap like everyone else, so don’t beet yourself up over your “failings”. Help yourself of tomorrow by finding how to cope with your symptoms today.