They referenced the Justice League's fight with Steppenwolf. So still acknowledging a shared universe..
I think the best thing for DC to do right now is not make another Justice League movie. Unlike Marvel I think DC characters thrive separately. Superman and Batman don't work in the same movie or show IMO. Tonally they're too different.
Marvel characters thrive on being interconnected. DC characters thrive when they're alone IMO.
To me you can't make a good Justice League movie. But if they had the right people in place they could make good movies for Aquaman, Flash, Green Lantern, Wonder Woman etc.
Reverend Meteor (well ok probably no chance of a good Flash movie with that Ezra Miller guy...to me he's really creepy)
The MCU has had far more success with lone characters than the DCEU. I think DC could have had significantly more success with Justice League and Supes/Bats if they had gone about it right.