Reborn: I Will Not Slay Dragons Again!

Leon, the dragon-slaying hero of the continent, is reborn and awakens memories of his second life—turns out he was originally from Earth! His real name is Li Ang. This time, he is born into a declining noble family with poor talent. Is he destined to fail from the start? No! Humble origins are not a disgrace; flexibility is the mark of a true man. Living a second life, he leverages his past life's top-tier mage skills to turn his fortunes around, no longer bound by duty and revenge. This life, he will live freely! — Description from novelcodex.org