Effective marketing tactics for promoting new payment methods in online gambling include targeted promotional campaigns that highlight the benefits of the new payment options, such as faster transactions, lower fees, or enhanced security. Utilizing email newsletters and in-app notifications can inform existing players about the new payment methods, while social media campaigns can engage a broader audience through eye-catching visuals and testimonials from satisfied users. Offering exclusive bonuses or rewards for players who use the new payment system can also incentivize adoption.