Time to first human answer is the one number worth fixing this month
Measure the gap between an inquiry arriving and a person speaking, then look at when in the week that gap is worst.
Pull the last sixty days of inquiries with timestamps. Nearly every firm finds one or two windows where the response time collapses: lunch, late afternoon on Friday, the days the parade routes close half the city, the week after a storm when everybody is on maintenance.
Fix the worst window before you fix anything else. An answering service that takes a real message, or a rotation that covers the gap, changes more than any wording change on your contact page.
Send a text within minutes of any form submission. It buys you time and it beats a competitor's voicemail, which is the actual thing you are competing against.
Set one rule the whole team can recite and then measure adherence to it. A callback standard nobody tracks is a standard nobody keeps.