Expanded the Earth

Traveling back in time to high school, I originally wanted to rely on the experience of my previous life to counterattack all the way, become a master, marry Bai Fumei, and reach the pinnacle of life. However, this script seems wrong... The earth is expanding! Humanity is fighting for survival! I traveled back in time without a ring or a peerless skill, but luckily I became a systematic cheater... I wanted to rely on the system to fight for humanity, justice, and world peace, but instead I went further and further on the road to death... This is not my intention. Unfortunately, my system is trying to kill me. What should I do? I feel very melancholy... Could you please give me some advice and wait online? It's urgent!