Best Push Act at the 2019 MTV Europe Music Awards. On November 6, 2019, a duet called "Tabú" between Max and Pablo Alborán was released. Max performed at the Jingle Bell Ball on December 7, 2019. The previously released song "Salt" was sent to digital streaming platforms on December 12, 2019. She collaborated with British-Norwegian disc jockey and record producer Alan Walker on the song "Alone, Pt. II", which was released on December 27, 2019. "On Somebody" was released as a promotional single on December 30, 2019. On March 12, 2020, Max released "Kings & Queens" as the fifth single from her then-unreleased debut studio album Heaven & Hell (2020). The song topped the Billboard Adult Top 40 on the chart dated December 12, 2020. She also appeared as a featured artist on the country song "On Me" with Thomas Rhett and Kane Brown. It was included on the soundtrack of the 2020 film Scoob! on May 15, 2020, accompanied with a music video. Max released "Who's Laughing Now" on July 30, 2020, and "OMG What's Happening" on September 3, 2020, as singles from the album. Heaven & Hell was released on September 18, 2020, alongside a music video for the song "Naked". The album peaked at number two on the UK Albums Chart and at number 27 on the Billboard 200. On November 13, 2020, Max was featured on "Stop Crying Your Heart Out" as part of the BBC Radio 2 Allstars Children in Need charity single, which peaked at number seven on the UK Singles Chart. "My Head & My Heart" was released on November 19, 2020, which served as a bonus track from the digital re-issue of Heaven & Hell. On June 8, 2021, Max released "EveryTime I Cry", which she stated was a "continuation" of her aforementioned studio album. She appeared on the R3hab and Jonas Blue song "Sad Boy" as a featured artist with Kylie Cantrall on September 10, 2021, in addition to Tiësto's song "The Motto" on November 4, 2021. 2022–present: Diamonds & Dancefloors In February 2022, Max hinted at a new project by replacing her 'Max Cut' hairstyle with cherry-red shoulder-length hair and emphasizing a red and pink appearance on her social media accounts. While interviewed at the Billboard Women in Music event in March 2022, she acknowledged that her second studio album was written the previous year during a personally difficult time.