To maximize your chances of winning big at online roulette, consider employing the Martingale strategy. This approach involves doubling your bet after each loss, aiming to recover previous losses with a single win. Additionally, focus on outside bets like red/black or odd/even, which offer nearly a 50% chance of winning. Set a budget and stick to it, ensuring you walk away when ahead. Remember, while no strategy guarantees success, disciplined play and smart betting can enhance your online roulette experience and potentially lead to significant wins.