New ask Hacker News story: How to learn work ethics and discipline as an adult?

How to learn work ethics and discipline as an adult?
3 by 165iq | 0 comments on Hacker News.
I was marked and regarded as "smart", "gifted" from my childhood, and aced up to half of my High School without almost any effort. I breezed through tests with no work where I saw other kids really struggle. Achieved highly in co-curricular activities as well. So, I never learned to work extremely hard sustained over a long period. College kicked my arse and I got below average grade. And I haven't achieved as much in my life as I think I should have been. I cannot concentrate on grinding Leetcode or finishing a 600 page programming book. How do I learn work ethics as an adult (now 24 yo)? How do I learn to work hard, with regularity, with no immediate returns for a long period of time? I still can learn extremely fast and solve hard problems with sporadic effort. Can you help me with this? Anyone who was on a similar boat but changed for the better? I have zero discipline. How do I get more disciplined? Please foegive me creating a throwaway for this.