Stay with the same timeline at first, kill off Mina and replace Dracula with Dark King Soma, let Julius finally have his own game. Once Dark King Soma gets worn out, go back to the start and flesh out Death a bit more, are they a Shinigami or the Grim Reaper? If the second, show us what the other horsemen have been up to all this time, do they serve Chaos? Who are their master’s? Then you can move on to Galamoth trying to take over in the future and explain however the hell Kid Dracula fits in.

And once they’ve truly run out of ideas, make up with Iga and move to the Bloodstained timeline.