DC's attempts to create a shared on-screen universe over the last decade have been obvious.
On the big screen Batman v Superman and Justice League tried and failed to launch a universe comparable in scope to the MCU, while on the small screen the Arrowverse triumphed with the 'shared' bit, but was ultimately unsuccessful in providing DC with a space to display their most well-known characters. On top of that, the shows on DC Universe did not live up to the streaming platform's name.
As all of DC's non-CW shows now seem to be moving to HBO Max, alongside a few new projects designed specifically for this new service, the company now has the opportunity to craft the shared universe it always wanted. Complete with big budget adaptations, A-list actors (it is HBO, after all), and even the ability to bring in its big gun characters - your Supermen, Batmen, Green Lanterns etc.
There is also the possibility that DC could royally mess this up though, leaving behind elements that were better kept, or rushing too quickly ahead with the new stuff and leaving fans with yet another disappointment.
In order to help prevent such an outcome, here are some guidelines that they should follow.