Albert Einstein made numerous contributions to science and society, and while he spoke on various topics, he did not explicitly mention a single change that would most benefit humanity. However, Einstein's ideas and principles can provide insights into his perspective on societal improvements.
Einstein emphasized the importance of human values, compassion, and global cooperation. He believed that the well-being of humanity depends on fostering a sense of unity and understanding among people. One of his notable quotes reflects this sentiment: "A human being is a part of the whole called by us universe, a part limited in time and space. He experiences himself, his thoughts, and feelings as something separate from the rest—a kind of optical delusion of his consciousness. This delusion is a kind of prison for us, restricting us to our personal desires and to affection for a few persons nearest to us. Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty."
Based on this quote and his broader philosophy, one can infer that Einstein would have advocated for a shift in human consciousness towards empathy, compassion, and a broader sense of global community. He would likely have encouraged humanity to transcend narrow boundaries and work together to address pressing challenges such as poverty, inequality, climate change, and conflicts. Einstein believed that by valuing and embracing the interconnectedness of all living beings, humanity could create a more harmonious and prosperous world.
It is important to note that Einstein's ideas evolved over time, and he expressed his thoughts on a wide range of topics. While the mentioned perspective aligns with his overall philosophy, there might be other aspects of societal change he would have valued as well.