"If there is a task that must be done, and only you can do it, then do it!"
This is the most common advice I give, especially when people ask what they should #focus on.
Let me start with an example from my own experience:
As a CEO, I want all my executives, managers, and team members to feel empowered and capable of making decisions within their expertise [and responsibility].
My focus should be on making the decisions [and tasks] that no one else can.
A CEO should be the visionary or at least carry the vision torch, and should make sure to lead that. Being responsible for the company culture, ensuring the right people are in the right positions, and managing and leading the board, investors, and senior leaders are also essential parts of the role.
For everything else, if you can remove yourself from being a bottleneck, that’s what you should do. This doesn’t mean avoiding involvement in other areas like product, sales, marketing, or even tech—heaven forbid! But ideally, you should let capable people make decisions and lead initiatives in those areas.
Here’s another example: If you’re the VP of R&D, only you can set the engineering culture (1st prio), ensure technology vision/strategy/roadmap, define hiring standards, ensure that tech debt and innovation are managed, and ensure that people are being mentored effectively, as a set of main examples.
I just left for a vacation, and I expect people to make all the decisions they could and should make even without my presence.
Related to the above -- there were years, when I didn't take vacations, or very little. Then others wouldn't as well, although I tried to encourage that. It took me time to make the connection -- if I don't take vacations, people think that this is the example and expectations I'm setting for everyone.