Not the Hero or Villain, I'm Just Background?

Transmigrated to the wrong world with a broken system, I inherit a Duke's title and command of 200,000 Imperial City Guards—sounds amazing, right? Wrong. I'm surrounded by chosen ones and villain protagonists causing chaos everywhere, yet somehow I'm relegated to background character status, cleaning up their messes. All I want is a peaceful life managing my estate, but everyone seems hell-bent on plotting against me from day one. Perhaps it's time to remind them that my ducal guards didn't sharpen their blades for decoration.