Travel back to past with cheat skill

The group of people who lived in the modern world, but were thrown toward the past with different group of individuals. Where alternate reality happened a past where dinosaurs survived from meteor, ice age creatures who survived from extinction and a humanity who only to learned to use the fire, hunt and cultivate. A different world from the history they learned from the future can they survived in the law of this world. But, in the midst of struggle our mc declare "I want to live peacefully." Can he achieve his goal in life? to become a great pacifist? (I doubt about it.) ---- I want to be create a peaceful world, promise...