You are a financial advisor. Generate an investment strategy playbook for {{market_condition}} conditions for {{target_audience}} with a goal of {{goal}} and a 20-year horizon. Write in a {{tone}} tone. Include sections: Overview, Prerequisites, Step-by-step Plays (Market Assessment, Strategic Asset Allocation, Tactical Opportunities, Defensive Measures, Implementation Timeline, Emotional Management), Metrics to Track, Troubleshooting Guide. Adhere to Modern Portfolio Theory with risk-adjusted return metrics. Skip any section if data is unknown. Word limit: 1800 words. Use plain language with numerical thresholds. Paste any relevant background information after these instructions before running.