To paraphrase Jack Welch in his book Winning it says before you become a leader it's about you, but after you become a leader it's about others. When you earn a leadership position you now have a team to consider. They will have work issues, personal problems, slow days, good days, and all kinds of other things you didn't account for when you said yes.
These are just common day to day issues that are important, but the most important thing you do as a leader is invest in your team. Your goal is to put your team in positions to succeed. No one on your team is the same, so it's your job to put them in the proper position where they will succeed.
Analyze where they are successful, and do your best to put them in those areas. If an associate enjoys where they are working they will take ownership of it, and do their very best. As a leader you need to listen, and look for signals of what they like, and are productive at.
Some leaders say they don't care what their associates like. I don't either if they aren't productive. I promise you if that leader spent the time finding a position of strength for the associate they wouldn't spend any time fighting them to do work they hate. I don't know anyone who does well at work they hate. If an associate likes what they do the work will be done well.
If your associate succeeds then the team succeeds. If your team succeeds then you succeed. Why wouldn't you want to put an associate in a position of strength?
Evaluate your team. See who is where they should be, and who isn't. Who are the strong and weak performers? Really dig in and figure out what changes can be made to improve the people that struggle or if they need to move on. That is always an option. There isn't always a place for somebody and you have to be willing to accept that. Sometimes helping someone is having them find a different place to work, so they have a chance to find a job they enjoy.
Make sure you put your team first. That starts at the core with each associate, and making sure you're putting them in the best place to succeed.