Write a multimodal content plan for an email newsletter in a {{tone}} tone to improve customer retention among {{target_audience}}. Primary platform: {{platform}}; adapt for LinkedIn and Twitter. Include: Content Strategy Overview, Text Content Layer, Visual Content Layer (at least 5 visual assets), Video Content Layer (30–60 sec), Interactive Elements, Cross-Platform Distribution, Measurement Framework. All recommendations must be specific to {{target_audience}} and include concrete examples. Output max 1800 words. Paste any relevant background information after these instructions before running.