For the number of times they might be "trying their own thing" only for it to end up as almost a copy of an existing piece, just objectively worse, there must be next to no creative inspiration left there.

On top of the aforementioned Assault on Arkham and Justice League War the Star Wars sequels first movie is practically a reboot of A New Hope. Just with little in the way of character development/consistency/interest, zero potential for suspense, and overall very little world building for what was meant to be a new era.

More on topic there are also still a lot of other DC Comics animated features that would work as stand alone ish ensemble movies like the Avengers movies were. Crisis on Two Earths not only had an incredible opening theme track that really should have ended up as the live action JL track, but a viable plot that opens up the multiverse by bringing in the Crime Syndicate from Earth 3. Even the doppelgangers are different enough in looks it wouldn't need something like Cavil being greenscreened to fight himself because Ultraman doesn't look identical to Superman.

But no, DC continue to shit the bed when it comes to movies and then can their successes despite vocal fans asking for more [Snyderverse].