Light Yagami ensures his continued survival amidst the threat of exposure by meticulously planning his actions, manipulating those around him, and staying several steps ahead of his adversaries. He uses his intelligence, strategic thinking, and the Death Note to eliminate anyone who poses a threat to him or could expose his identity as Kira. Additionally, Light takes precautions to maintain his cover, such as using aliases, wearing disguises, and creating alibis to avoid suspicion.