No one can do it all. You have a great group of employees working for you who can lighten your workload—and benefit from learning new skills. If you are new toor you have trouble letting go of assignments, start with these tasks:
Meeting planning. Pick someone to schedule the meeting, plan the agenda, assign action items beforehand, arrange snacks and so on.
Training. Let tenured staffers train new hires, or recruit employees with expertise or skills in a specific area to train their co-workers.
Research. Outline a project, idea or need, and ask an employee to do some investigating, data gathering and analysis, and then report back to you.
Those tasks take some pressure off you, while building skills your employees can put to good use.