Everyone feels overwhelmed by their inbox. That's the nature of the age.
Try this: Focus on your outbox instead.
Start there in the morning. Check that at night.
Your inbox is people telling you what they want you to do, what they need from you, and what they want you to be worried about. Everyone (and everything) else is in control.
Your outbox is who you have connected with, what you suggested or initiated, what you have accomplished, and what you need. You are in control.
Instead of “Look at all I have to do, I’ll never get to the end of it” try this switch and see what “Look at all I have done, what do I want to do now” does for you.
See if that helps you lead as you.