Most advice starts with photos. Photos matter, but they move bookings over months. What can move bookings this week is price — specifically, where yours sits against what comparable places ask for the same nights. Below is the list ordered by effort against effect, with the honest caveat up front: nothing on it is guaranteed, and anyone promising otherwise is selling something.
One more honest note: sometimes bookings are down because the whole market is down, and no listing-side change fills a street nobody is visiting. If this month is unusually quiet, start with why bookings slow down before reworking a listing that was never the problem.