I have written an original legend about an indigenous Chilean girl who saves her people from volcanic destruction. It would make a great picture book; the problem is that it is 3,500 words long! It is written for readers of about 4th grade level. Is there another type of format rather than picture book that would fit something of this length and for this grade level?Well, that's still too short for a chapter book.
There are some picture books for older readers that have texts of this length. But they're mainly supported by teachers and librarians-- so I would be asking myself how such a topic fits the needs of curriculum. I know they aren't doing South American indians in 4th grade. Why will teachers and librarians want this enough to spend their (smaller and smaller) budgets on it?