In May 2020, Brooke revealed the cover of her upcoming memoir, Finding Your Harmony. On July 17, Brooke released her first Spanglish single "500 Veces", with Dominican rapper Messiah, featuring Latin trap beats. She collaborated once more with Afrojack in her own single, "What Are We Waiting For?", released on October 16. The week after, on October 23, Dutch DJ Fedde Le Grand released the song "Gatekeeper" with Brooke. On October 29, Brooke released her first original Christmas single "Baby I'm Coming Home". On November 13, Joe Stone released "Feeling Dynamite" with Brooke. She featured on Laidback Luke's song "Dance It Off", released on December 4. Finding Your Harmony was released on October 13, 2020. The memoir covers aspects of her life, including her childhood and her rise as a solo artist. In August 2020, Brooke stated she wants to release an album in the future but is taking her time, and that it could be released in 2021. Brooke was cast in the film High Expectations, playing the role of "Sofia".
