Kingdom of the Sun (The Hollow Crown Series #1) by HP Nero:
 
Kingdom of the Sun is an epic fantasy about Mirage, a royal girl sold to a mythic kingdom where magic flows freely—and nothing is as it seems. As she battles through brutal training, fractured identity, and a terrifying magical awakening, she forges bonds with a fierce found family. But as gods rise and conflict brews, Mirage must decide what she's willing to give for those she loves. In a world where power is survival and sacrifice is destiny, Mirage’s must tie the threads of fate herself.

"...Our narrator is neurodivergent; a choice that lends the story remarkable authenticity... Mirage is a captivating heroine: unconventional, intelligent, and weighed down by challenges that resonate deeply. Her journey through the world of the Tessiah held me enthralled from the first page, and I’ve already braced myself for the reading slump sure to follow its conclusion. If I were still in the agenting business, I would have been all over this book." -A.G. on NetGalley, a retired NYT columnist