Start with high-confidence holiday ya books, then narrow by subgenre or adjacent topics.
How to Excavate a Heart
Jake Maia Arlow
Finding My Elf
David Valdes
I've Got My Love to Keep Me Warm
Mariama J. Lockington
All I Want for Christmas
Wendy Loggia
Hour of the Pumpkin Queen
Megan Shepherd
Sally's Lament
Mari Mancusi
Christmas at Saddle Creek
Shelley Peterson
Light Up My Life: a Holiday Novel
Kasie West