A System in My Twilight Years

My name is Pai Xiaoxing. After I transmigrated, I found no golden finger, so I decided to use my knowledge of Earth to get by in the mundane world. Just as I was preparing to enjoy my retirement, a System suddenly appeared, claiming it could help me make a comeback and become the greatest person in the world. Big Brother System, you're too late. I'm just a decrepit old man now, enjoying my golden years.