As humans have developed an additional faculty of rationality and logic, we may have an additional purpose than those of the animals. As this faculty may make us challenge our purpose of simply procreating and following happiness. It may want us to find an existential purpose, in the way of humanism. It may ask us to bypass our own happiness for the happiness of others. And it may ask us to not procreate to slow the overpopulating of the earth.
Thus while the purpose of animals was to simply procreate and find short term and long term happiness, the human mind has evolved to need other needs as well. These needs may even overwhelm the underlying urges.
It is here that existentialism, humanism, religion, and others thrive and secularism breaks down. But I will do my best to bring a secular evidence and philosophy based approach to this aspect of purpose and meaning of life. As it is here that the work needs to begin.