it sounds nuts and random but I wanna see Duke Thomas vs Superman.
I'd also love a story where DC does a Hickman/Al Ewing style expansion on Black Lightning's mythos and canonizes Freeland, Georgia. ideally as part of a greater storyline that focuses on metahumans and further expands on the mythology of metahumans in the wider DC landscape as well.
Black Lightning in space would be rad too.
I'd love a seinen-esque martial arts storyline that really showcases the various fighters in the DCU and establishes DC's martial arts landscape as a viable niche; with a revamp version of Bushido (Ryuko Orsono) as the focal character.
I'd love a sword and sorcery epic set in DC's ancient Africa focusing on immortals like Dr. Mist and the ancestors of characters like Nubia, Black Manta, Vixen, etc.; matter fact, just more stories set in or including Africa period.