In a community management scenario, a community manager is tasked with improving engagement among members who have expressed dissatisfaction with the current communication methods. The manager decides to implement a multi-channel communication strategy that includes email newsletters, social media updates, and community forums. After three months, the manager surveys the community to assess the effectiveness of these methods. If the survey results indicate a 40% increase in engagement through email, a 25% increase through social media, and a 15% increase through forums, which of the following strategies should the community manager prioritize for future communications to maximize engagement?