To maximize your loot in the GTA Online Casino Heist, focus on planning and teamwork. Choose the right approach—silent or aggressive—based on your crew's strengths. Invest in high-level equipment and upgrades to enhance your chances of success. Scout the casino beforehand to identify security patterns and potential escape routes. Communicate effectively with your team during the heist to coordinate actions and avoid unnecessary alerts. Finally, consider the optimal time to execute the heist, as this can influence the amount of cash and valuables available. With careful preparation, you can significantly boost your take.