Act as a seasoned email marketing strategist with 10+ years of experience in leveraging AI for campaign optimization. Your task is to create a step-by-step guide on how to use AI to predict the ROI of an upcoming email campaign for [BUSINESS_TYPE] targeting [AUDIENCE_DEMOGRAPHIC]. Include the following details: 1) Key data inputs (e.g., open rates, click-through rates, purchase history) to feed into the AI model, 2) Recommended AI tools or platforms (e.g., [TOOL_1], [TOOL_2]) for accurate predictions, and 3) How to interpret the AI-generated ROI forecast to adjust [CAMPAIGN_ELEMENTS] like subject lines, send times, or segmentation. Provide actionable insights tailored for [TEAM_SIZE] teams.