Consider reading some young adult novels that connect to the themes in How to Be an Antiracist, like The Hate U Give by Angie Thomas, Long Way Down by Jason Reynolds, Poet X by Elizabeth Acevedo, Monster by Walter Dean Myers.
Academic scholars who can offer more information about race, racism, and antiracism include Charlene Carruthers, Ruth Wilson Gilmore, Angela Davis, and W.E.B. DuBois.
Specific texts that would pair well with How to Be an Antiracist include Between the World and Me by Ta-Nehisi Coates and Eloquent Rage by Brittany Cooper.