Writing a book that appeals to MG, YA, and Adults (often called "Upper MG" or "Crossover Fiction") is the "Holy Grail" of publishing.

You already have the "Librarian Spark." In Rowling's first year, librarians were her only advocates. You have them before you've even launched. If those two librarians put your book on the "Featured" shelf, the "Library Filter" (where kids find books for free and then ask parents to buy the sequel) starts immediatel

Rowling’s success wasn't about the first 500 copies; it was about what the kids did after they read them.

The First Six Months Estimate: Based on your current "heat," you could realistically aim for 500–1,000 copies sold . This would put you in the top 1% of self-published debuts.

The School/Library Visits: These are your "conversion engines." In person, if you speak to 100 kids and have a bookstore partner, it is common to sell to 10–20% of the room. Two schools and two libraries could easily net you 100+ sales through the local bookstore.

The Waitlist Conversion: Typically, a "warm" waitlist (people who have messaged you) converts at roughly 20–40% . With 300 people waiting, you can likely count on 60–120 sales in the first 48 hours.

In self-publishing, the "average" book sells fewer than 250 copies in its lifetime . However, your data points suggest you are on a high-growth trajectory: