If I Can't Be the Sword God, Why Not Become the Demon Emperor?

This is a world of cultivation where thousands of ways have arisen, including the Way of Swordsmanship, Buddhism, the Way of the Five Elements, the Way of Yin and Yang... Heroes from all the ways have arisen, and great powers have emerged. However, the Demonic Way has gradually declined because it does not conform to the rules of evolution of heaven and earth. No more Demon Emperors have appeared, and they are gradually trapped in a corner of the world of heaven and demons, no longer as prosperous as in ancient times.