Among all the things you could do, there is usually one that matters most. One thing that, if accomplished, would make other things easier or unnecessary.
Finding this one thing requires honest assessment. What is the bottleneck? What is the leverage point? What would change everything if it changed?
This one thing deserves your best energy and attention. Other tasks can wait or be delegated. But the one thing needs you, needs focus, needs priority.
What is your one thing right now?