The person you were is useful competition because their weaknesses are documented.

You have detailed records on your former self: exactly where the effort failed, which excuses worked, what conditions produced the collapse. No external competitor gives you that kind of access. It makes your own past unusually useful as something to measure against and work around.

Write down the three ways you have most often undermined yourself. That list is a strategy document. Most people never assemble it, and it is sitting in plain view.