I think everything hinges on how Dany decides to react. A direct assault would kill Drogon but won’t necessarily win her the city. Cersei’s armies are prepared to deal with a dragon now. It’s an opportunity to see how well Arya can use her faceless men techniques. They are adept not only in disguises but also in poisons and traps. Cersei’s favorites.
Another possibility is Cersei being killed by Tyrion but I feel like he’s a bit broken now.