Do We Still Need Heroes in Peacetime?

The moment I finished writing my fantasy novel, I transmigrated straight into it—as the legendary Hero, no less! Epic adventures await... or so I thought. Turns out humans and demons have already signed a peace treaty and are living in harmony. So what's a Hero supposed to do in an era where nobody needs saving? Become a celebrity? A living relic? And if this is really peacetime, why does everyone still insist the Demon King is my destined final boss?