The underlying concept of Brett Hartvigson's blueprint is the development of a visionary financial plan. Hartvigson believes that financial advisors don't only focus on immediate objectives but also consider long-term aspirations that align with their clients' goals for the future. This involves being aware of the client's financial situation, future goals, and their tolerance to risk. Through the development of a comprehensive plan that anticipates potential challenges and opportunities, advisors can guide their clients toward steady financial growth.