Several factors can contribute to a decline in the retention rate of Netflix users who prefer series. First, series have a limited number of episodes, and once viewers finish their favorite shows, they may feel less inclined to continue using the platform, particularly if there are no new series that capture their interest. Second, unlike movies that can typically be watched in one sitting, series require a longer viewing time. As a result, users may become disinterested due to the lengthy wait for new seasons or episodes. To tackle the retention challenge, a dual strategy is necessary. On one hand, Netflix could enhance its content offerings by consistently updating its library with a wider range of appealing series, and even striving to obtain exclusive rights to popular series to keep viewers engaged. On the other hand, Netflix could refine its recommendation algorithm to expand users' preferences and assist them in discovering new series, thereby keeping them invested in the platform for extended periods.