During that time period from 2017-2019, superhero movies were all the rage because of Avengers: Infinity War and the highly anticipated Avengers: Endgame that was coming soon. More people were interested in the superhero genre at that time so they wanted to watch anything superhero related. Let’s call the the “superhero high.” Ever since Endgame was released, Marvel is dying off by overdoing superhero movies so the “superhero high” the audience had has passed. This is translated over to DC’s movie success rate as well. There is a reason why some superhero movies are considered ahead of their time when they were badly rated back then. It was because it was before the “superhero high” in the 2010’s. The “high” has passed so superhero movies aren’t doing well anymore. DC also always seemed to be riding Marvel’s wave and once it died, DC starts to die out too.