This chapter delves into the critical importance of fostering sustainable health systems and public health, highlighting the pivotal role of public health initiatives and primary care in creating health systems that are sustainable, equitable, and cost-effective. It argues for a healthcare model that proactively addresses health issues through prevention, early intervention, and comprehensive management, thereby enhancing health outcomes and reducing economic burdens. The discussion extends to the necessity of lifecycle strategies, emphasizing the need for continuous health investments from prenatal stages to end-of-life care, ensuring holistic well-being across all life stages. The chapter concludes with a strong call to action for all stakeholders, including governments, healthcare providers, the private sector, and civil society, to unite in the promotion and implementation of sustainable health practices. By prioritizing public health and primary care, committing to lifecycle health investments, and embracing innovative solutions, we can construct resilient health systems capable of confronting current and future health challenges while upholding the principles of equity and sustainability.