Man of Steel The Batman (introducing Joker and Harley) Wonder Woman The Trinity (basically BvS. Superman can die here.) Aquaman Justice League
Flash Cyborg Man of Steel 2 (featuring supergirl and brainiac) Shazam (with black adam and Superman) Wonder Woman 2 Green Lantern Justice League 2 (with the evil justice league aka lex and his goons) Aquaman 2 The Batman 2
And from that they can just introduce more and more heroes. No need for an overarching story like the mcu.
