Legends never die

You are about to die, defeated by an unknown, powerful villain. Before you breathe your final breath, an angel woman comes from the sky and kisses you. Apparently, it saves you by sending you a few days into the past. You wake up fully healed, safe, and stronger. You also know that they are coming and you need to be ready. Nobody knows who or what they are, but as a legendary hero, you have to save the world. You are given blessings and strength to protect the world, but how can you handle it? Last time you almost died, and you don't know who the villains are, what's their power... You must investigate, grow in strength, fight, and survive. Legends never die, they say. Use your strengths to keep it this way.