I completely agree, Wendy. I take no issue with writers writing outside their lived experiences, as long as the publishing industry does their part to elevate minority authors. The fact that I can't think of a novel by a Latinx author off the top of my head about environmentalism (while I can think of several by white authors) I think points to gaps in my own reading, but also a wider issue of which books get published and which get the most marketing.
One book that I think might be thematically similar to this one is I Am Not Your Perfect Mexican Daughter by Erika L. Sánchez, which is another coming of age novel with a mystery component, that strongly focuses on Mexican-American identity. Although the characters in Waiting for the Night Song are not Mexican, this might be an interesting comparison for anyone looking to read another book about Latin American identity.