This is one of the most counterintuitive things about leadership roles IMO.
If you get promoted there, it’s often because you got a lot of things done yourself in an IC role. And then the fewer things you do yourself, the better off you, the company, and your reports are once you’re in a leadership role.
So you have to learn that feeling idle compared to what you used to feel like isn’t a sign that you’re doing a bad job.