The Catch Nobody Mentions
Here's the catch, and most courses won't tell you: building these external systems takes the exact abilities ADHD makes hard, planning, organizing, getting started.
You need executive function to build the thing that covers for your executive function. That's not a flaw in the plan; it's the single most important thing to design around, and it's why "just set up a system" has failed you before, the setup itself was the hard part. Two ways through, and we use both. One: make the very first step so small and so cued it barely counts, not "build a system," but "put one sticky note where you'll see it." Two: borrow someone else's executive function to get it standing, a friend, a body-double, a coach. That's not weakness or dependence; it's the oldest learning move there is, someone holds the part you can't yet, until you can. The cold-start problem is the whole reason the people-layer of this course exists.
This article is drawn from the Attention Deficit course and describes population-level research, not personal medical advice. Talk to a qualified practitioner before changing anything.