Old Man To Overpowered Avatar

After a lifetime of regret, a dying 73-year-old man awakens in the body of his teenage self, gifted a second chance at life in a dangerous world ravaged by monsters from dungeon gates. Guided by a sassy, all-powerful System that no one else has, he must navigate the perils of his new reality and overcome his rock-bottom power ranking. His goal is to finally become the hero he always wished he could be, starting from level one.