In September 2019, Yung Miami confirmed to Ebro Darden on Apple Music’s Beats 1 that the duo planned on recording a new album, expecting to release it early in 2020. On June 19, 2020, City Girls’ second studio album, titled City on Lock, leaked in its entirety online. JT announced hours later that the album would be released at midnight of the same day. The album’s first single, “Jobs”, was released hours before the album alongside a music video.
The album includes guest appearances from Yo Gotti, Doja Cat, Lil Durk and Lil Baby. In March 2021, their viral unreleased song “Twerkulator” amassed popularity on social media application TikTok, after 20-year-old dancer Layla Muhammad choreographed a dance for the song.
The song had since been used over 1,100,000 times on the platform, with creators such as Charli D’Amelio and Malu Trevejo performing the dance. However, despite this viral restore, the song remained unreleased as the basis contains a sample from “Planet Rock” by Afrika Bambaataa and Soulsonic Force, which was yet to be cleared. On May 21, 2021, “Twerkulator” was officially released.
On October 29, 2021, Yung Miami released her debut solo single, “Rap Freaks”, alongside its music video. A sex-positive track , it sees her reference various rappers, including Megan Thee Stallion, Diddy, and Meek Mill. Miami explained that “the song is showing love to all the rappers right now, it’s nothing personal. I [named] a bunch of the guys who are on top, that’s hot, that’s poppin’. Nothing is personal, nothing is literal, I’m just having fun”. The song debuted and peaked at 81 on Billboard Hot 100, becoming Miami’s first entry as a solo artist.