Share Your Light
You got to the position you have by knowing stuff and doing stuff.
Share that knowledge and training with your people. If you grow their skills and competencies, you can trust them with more of the important stuff. They develop as more successful professionals, and it will free up your time for the things only you can do. Everybody wins.
(image source: https://www.facebook.com/photo/?fbid=1032078182262984&set=a.130195192451292)