According to the Professional Scrum Product Owner II guide, one of the key competencies of a Product Owner is to validate product assumptions and hypotheses using empirical evidence1. This means that instead of investing a lot of money and time into building a product based on unproven ideas, the Product Owner should conduct small experiments to test the viability, desirability, and feasibility of the product2. These experiments can take various forms, such as prototypes, mockups, surveys, interviews, landing pages, etc. The goal is to gather feedback from real or potential users and customers, and measure the outcomes against predefined success criteria3. Based on the results of the experiments, the Product Owner can then decide whether to persevere, pivot, or terminate the product idea4. This approach helps to reduce the risk of wasting resources on products that nobody wants or needs, and to focus on the most valuable and promising ideas.

Explanation
According to the PSPO II resources, a product with high current value and low unrealized value is in the harvest stage of the product lifecycle1. This means that the product has reached its peak and is facing increasing competition and decreasing customer demand. The best strategy for this stage is to maintain the product quality and customer satisfaction, but reduce the investment in new features or enhancements. The product owner should seek other opportunities for future growth, such as developing new products or exploring new markets23. References:
* 1: Product Lifecycle Management
* 2: Product Strategy
* 3: Evidence-Based Management