What Superman needs is to acknowledge the Man of Steel film loosely to keep cohesion with the rest of the successful DCEU. Kinda like how Marvel did with the Hulk movies. So, hopefully we get Cavill back, but if not, we can at least have a backbone to go by without rehashing origins.
So, we get an actual sequel.
We start with Last Son of Krypton. Let’s say it comes out in...2021. Here, we have Brainiac as the big bad. Lois and Clark are planning a wedding. Clark still has his Secret Identity. This is where we open the door for Supergirl with Brainiacs bottled cities. We focus (for the final time) with The Whole Krypton backstory saga (Man of Steel=origin, BVS=Death, Last Son=completion). Supes fully embraces his mission to be Earths protector and the true Last Son of Krypton. We have an appearance of Hanks Henshaw as Brainiac blasts his family to bits in the opening.
Then, in 2022, we release Supergirl. Here, this is a more “Shazam” fun movie. Give her Reatron as a villain.
At this point we do a JL sequel where the Legion of Doom is your villains and Lex returns there.
In 2023, We have Man of Tomorrow, where a Superman appears who claims the mainstream Supes we have been folllowing is not the true deal, but an imposter and this new Superman is the real deal. Eventually giving us Cyborg Superman and a tie to the previous Last Son. The movie begins with the wedding of Lois and Clark which gives us drama with Lois wondering if this is the real Clark. By the end of the movie, Lois is preggers
In 2024, using the Kryptonian DNA that Cyborg Superman had of Kal, Cadmus engineers a clone. We get a Superboy movie with Parasite being the big bad.
A Supergirl Sequel in 2025.
Of course, even in spinoff movies, Superman appears in all.