Identify 4 unconventional assets or categories of assets with untapped potential for significant appreciation in value. Explore the factors that contribute to their current undervaluation and the potential catalysts that could lead to their increase in value. Develop a comprehensive marketing strategy for promoting the investment potential of these assets, including a detailed content plan for blog posts, podcast episodes, YouTube videos, and social media posts on various platforms. Provide step-by-step instructions for monitoring the performance of these assets, adjusting the marketing strategy, and identifying the optimal time to sell for maximum profit.