I think the most important component of discipline is fear. For example, after I started having migraines frequently enough, I finally gained the discipline to quit caffeine.

Unfortunately, I don't really know what you can do to achieve what you want. But I think if you just try to do at least one thing every day to improve in some way, you will move toward your goal.

I also think you can try to put yourself into an environment that moves you toward your goal. Like, if you want to get good at something, you have to practice, right? So like, if you don't have a job, then get one. And if you haven't tried management/lead, try that. Or if there's something you're bad at or afraid of, then try to do that in your job.

For example, I was not experienced at low level programming, but I wanted to be, so I found a job doing that. Since it was my job, and I was trying to maintain a good reputation, and I didn't want to be embarrassed, I had many fears driving my discipline to study and work hard; and it was a successful outcome for me.

Btw, if you can't think of anything else to be afraid of, remember that you will feel disappointed in yourself and ashamed. There's always that to be afraid of; and we forget that in our moments of laziness.