In need for tips for reducing ADHD..

It's hard, really hard. I have so much I want to do. I know how to. I just get distracted. It's not that I need a phone to get distracted. I can just sit there for hours and not get a single work done. And yes, I have a lot in my plate. Yes, I've tried every possible thing said online, like dividing your work into smaller portions, taking small breaks, stuff like that. It just doesn’t work for me. Nothing does. I really need help.