I would...
-Make Curse of Darkness a 2D game, because dammit, it should have been 2D
-Make Curse of Darkness a side-story game
-Remake Legends and the Christopher games, just for the hell of it (not un-retconning Legends, mind you, just making it a better game)
-Add a game for Soleil (and name it Legend of Dracula 3 in Japan)
-Not focus so much on the story, dammit