The book ahead looks forward instead of back: what's already in your diary for the days coming. Find it under Reports in the sidebar (owners only).
Choose the next 7 or 30 days and you'll see how many confirmed appointments are already booked, how many customers are coming, what those appointments will bill if nothing changes (from-priced bookings count their starting price, so treat it as a floor), and the deposits already paid towards them. A chart lays the value out day by day, so a quiet week shows itself while there's still time to fill it.
That's the report's job: a thin stretch ahead is your cue to send a campaign or open the waitlist before the week arrives, not after it.