u/ForwardBee9346

Two years ago, I self-published an MG fantasy novel on KDP. My sales were negligible (<50), and it was mainly an experiment in completing a book and "getting it out there." Since then, I have expanded the world of the story significantly and am considering writing a YA version with a revised plot but a very similar premise and similar (albeit deeper/more complex) character dynamics. If I were to write this book and query, would I have to mention the self-published book in my query letter? Would it be an automatic pass for agents?

Thank you!