This is a very interesting topic, @hannabug99.83221! So many great ideas already!
I’ve dreamed of an animated feature titled “One Bad Day” - a play on the phrase that Joker uses in The Killing Joke. I love comics that show things from Batman’s perspective so this would center around daily events that we as the reader never get to see - mundane tasks, internal “complaint monologue”, and out loud problem solving. A simple villain would play nicely, allowing all the focus to be on The Dark Knight. The finale is Batman saying that in spite of all the bad things happening that evening, he still loves protecting the city. To the audience, it would showcase his true heroic abilities and the sacrifices Bruce makes to keep Gotham safe.