As a collaborator, Sullivan worked with Frank Ocean, GoldLink, Mali Music, and Blige, co-writing four songs -- including two singles -- for the latter singer's 2017 album Strength of a Woman. Months after that LP was released, Sullivan and Bryson Tiller connected for the title song to the second-season soundtrack of Issa Rae's Insecure. Sullivan in 2019 co-wrote and sang on PJ Morton's "Built for Love," another Grammy-nominated recording for Best Traditional R&B Performance, and graced both Kindness' "Hard to Believe" and Anderson .Paak's "Good Heels." She returned as a lead artist with "Lost One" and the Grammy-nominated "Pick Up Your Feelings," and continued in early 2021 with the H.E.R. collaboration "Girl Like Me" and Heaux Tales, a Grammy-nominated EP containing those three singles.