This is after all mirrored in psychological literature in the models of willpower as a finite or an infinite resource.
Although the simple "I decide I won't have akrasia, so I won't" is doomed to fail, the meta-focus is interesting and likely to be productive:

• What would it take to be a disciplined person?

• Which transformation in my environment can I enact so that I become more disciplined?

• How can I construct a positive feedback loop of acting on my decisions?

And so on...