Counterattack in Life: I Obtained the Billiards Quasi-God System

I haven't found a novel about billiards, so let's write one ourselves, a cool article about billiards + system: A small clerk in a county town with no background, no hope of promotion, meager income, disliked by his mother-in-law, and abandoned by his college girlfriend. He unexpectedly obtained a quasi-magic billiards system. He became famous in the small county town, became invincible in all provincial towns, participated in national competitions, and reached the pinnacle of his life.