Also, the Reading Google Classroom has section for independent reading.
https://whatshouldireadnext.com/
https://imaginationsoup.net/middle-school-books-reluctant-readers/
https://bookriot.com/2015/05/26/ultimate-guide-books-reluctant-readers-ages-12-13/
https://www.commonsensemedia.org/lists/best-sports-books
http://www.whowasbookseries.com/who-was/
https://bookriot.com/historical-fiction-books-for-middle-school-readers/
https://www.amazon.com/Childrens-Books/b/?ie=UTF8&node=4&ref_=sv_b_4