Delegate everything possible.
A slightly less breif guide…
Delegate everything to person or persons who fit the following criteria.
[li]They’re in your department or an adjacent/connected department.[/li][li]You trust them to be able to do it.[/li][li]They have less other work to do than you.[/li][li]They are your subordinate (This would usually be redundant based on the above item)[/li][/ul]
Do the work you can’t delegate by yourself. (At the same time figuring out a way to make it delegatable in the future)