Generate a series of 5 automated email sequences designed to increase upsells and cross-sells for a SaaS product.  Each sequence should target a specific customer segment based on their in-app behavior (e.g., frequent users of feature X, users who haven&#8217;t upgraded in 3 months, users who recently purchased product Y).  Each email should include a clear call to action, compelling value proposition highlighting the benefits of the upsell/cross-sell offer, and a sense of urgency or scarcity.  The sequences should be designed to avoid being overly promotional or spammy, maintaining a conversational and helpful tone.  The sequences should also incorporate personalization elements using available customer data (e.g., name, company, usage data).  Provide the subject lines, email body copy, and call to action for each email in each sequence. The sequences should be designed for a SaaS product offering a freemium model with 3 different paid tiers and 2 add-on products.  Assume the customer data available includes usage frequency of specific features, last login date, current subscription tier, and any previously purchased add-ons.  The goal is to maximize conversion rates from free to paid, and from lower-tier subscriptions to higher-tier subscriptions.  The target audience is small business owners.  Measure success by tracking the conversion rates of each email sequence and the overall increase in revenue generated from upsells and cross-sells.