[hsk0823]

I think the Peter principle, the idea that people are promoted to until they are incompetent in their roles, comes into play.

What worked for you to get to the job isn't necessarily going to work for you to succeed in the job, I agree with others saying that it's not a time management issue, it's a change in perspective that's require, you no longer have the ability to do everything for everyone, you now have to lead people you can trust to fulfill those tasks better than you could, as your responsibilities grow, the rest of your team doesn't stay static, they also grow with you.