In 2018, Lynch transitioned to a more aggressive character starting at SummerSlam, when she attacked Charlotte Flair, presenting herself as an unfairly-treated underdog and dubbing herself "The Man", resulting in a large increase in her popularity. In 2019, she won a Royal Rumble match, and at WrestleMania 35 won both the Raw Women's Championship and SmackDown Women's Championship, making her the first woman to hold both titles simultaneously and a four-time WWE women's champion. She lost the SmackDown title the following month but then set the record for the longest reign as Raw Women's Champion at 399 days until going on a hiatus due to pregnancy in May 2020. In August 2021, Lynch returned at SummerSlam to confront SmackDown Women's Champion Bianca Belair, whom she would defeat seconds later to become a four-time SmackDown Women's Champion.