Ebb and flow is very common with reservations so don’t worry! Did you offer the 20% new listing discount? If so, that probably gave you an immediate advantage for reservations. Also as a new listing Airbnb bumps your listing up in the search results to help you get started.
Once that “bump up” and newness ends, you will naturally have a bit of a lull. But now that you have some good ratings and a few reservations under your belt, your bookings should start to come over time but at a slower pace. It does seem like a let down when you immediately saw so many bookings at once. But it’s totally normal to have periods of no reservations at all.