I Have a Ceiling, but It Can Only Be Used as a Backdrop?

Good news: You have traveled through time and gained conceptual-level abilities, which will forever be the ceiling of the current world's military power. Bad news: You can only be a background character, create various sects, holy places, and kingdoms to change the world structure, leaving many skills, elixirs, magic weapons, and treasures for the protagonists and supporting characters to fight for, shaping the fate of all people, and not affecting the development of the main plot of the world.