Do not wait for strangers to find you. The professionals who get value out of this in week one are the ones who move their existing book across.
What works: send your booking page link to everybody you already see, tell them it is where you take bookings now, and keep taking bookings the old way for a few weeks while people migrate.
What does not work: announcing it once on social media and assuming people saw it. Individual messages to your regulars convert several times better than a post.
Their bookings and reviews are also what makes your page persuasive to a stranger later, so this is not just admin — it is the thing that makes the directory work for you.