My System Is Too Over Powered

[Ding! You have spent 10,000 Universal Coins and purchased the Shadow Monarch Talent.] ... Fifty years ago, cosmic energy descended upon Earth. Animals mutated into terrifying monsters. Humanity retreated behind massive walls and built enormous Base Cities to survive. In the chaos, an ancient alien spaceship was discovered beneath the ruins of a forgotten civilization, revealing cultivation techniques that allowed humans to absorb cosmic energy and evolve beyond their limits. Thus, the Age of Martial Warriors began. In this new world, strength reigns supreme. The weak struggle to survive. The strong rule everything. Ethan Velmire should have been one of the lucky ones. Born into the prestigious Velmire Clan of Manhattan Elite Base City, he possessed wealth, status, influence, and a grandfather powerful enough to shake cities with a single command. Unfortunately... He was talentless. While his peers advanced rapidly, Ethan remained stuck at the bottom. His father had already given up on him. The clan viewed him as a disappointment. Even his own sister, Nova Velmire, was a once-in-a-generation genius whose brilliance made his failures appear even worse. Then everything changed. After awakening the memories of a previous life, Ethan activated something that should not exist. The Infinite Shop System. A mysterious system capable of selling anything. Shadow Monarch. Ultra Instinct. Legendary bloodlines. Divine talents. Ancient weapons. Forbidden abilities. As long as he could afford the price, nothing was beyond his reach. With limitless possibilities before him, Ethan begins a journey from the clan's greatest disappointment to an existence standing above martial warriors, monarchs, and even gods themselves.