I asked ChatGPT

The phrase "Be a Better Human" generally conveys the idea of self-improvement and personal growth with a focus on positive qualities and ethical behavior. It suggests striving to enhance one's character, values, and actions in order to contribute positively to oneself, others, and the world. This can involve cultivating virtues such as empathy, compassion, integrity, and resilience, while also fostering a sense of responsibility towards others and the environment. Ultimately, being a better human implies an ongoing commitment to self-reflection and continuous efforts to make positive contributions to the well-being of individuals and society as a whole.

Seems spot on.  Feel free to comment below.