How do I manage a huge inbox and decide what really matters?

You have learned to triage, and that is no small thing. What overwhelms you now is the sheer volume and the constant judgment calls about what deserves attention and what can wait. That weight is real. Deciding all day long is tiring in a way that simple busy work is not.\nThe trap is trying to give every message the same careful thought. You cannot, and you should not. Most of what lands in an inbox does not matter much, and a few things matter a great deal. The skill is not reading everything perfectly; it is quickly sorting the few that count from the many that do not, and letting the rest be less than perfect.\nSo give yourself simple rules instead of fresh decisions every time. Decide in advance what always needs fast action, what can wait for a set time each day, and what can be ignored or handled in one line. When you are unsure, ask what happens if this waits until tomorrow; usually the answer is nothing. Rules carry the load your judgment is carrying now. Build a few and the volume stops ruling you.