The inbox was actually four inboxes, none of them talking
Four shared addresses, three people forwarding to each other, and no rule about who answers what.
Merged into one inbox with folders and filters, wrote the reply templates for the ten most common asks, and set a daily 20-minute triage block.
Nothing unread by end of day, and the owner stopped forwarding me things to find. Sample words - replace with a real project when you can.