Your post is very good
your last statement "we still know no other purpose for being alive beyond living longer and reproducing" is looking materialistic. if every matter and energy has its purpose for its existence then surely we are here for some purpose. today's science is still in developing. a lot of questions still we don't have an answer. purpose of existence is still a debatable subject among scientists so we have to search this answer in a spiritual and religious way then we may got the answer.