The Ballad of Songbirds and Snakes could continue with a sequel, and given the changes in the 11th Hunger Games, this has the potential to be the darkest story yet. Lucy Gray's story explained how President Coriolanus Snow became the dictator seen in The Hunger Games, and though the ending brought a satisfying close, there is room to expand. In the years that followed, Snow implemented a variety of changes to the games. The most significant of these changes would have started with the 11th Hunger Games, and this could be worth exploring.

https://screenrant.com/ballad-songbirds-snakes-sequel-darker-hunger-games-change/