Final answer:
The author's main purpose in the text is most probably to illustrate the commonality of the Hero's Journey structure in literature and analyze the nuances of its use across different texts.
Step-by-step explanation:
The author's main purpose in the text is likely to show how common the structure of the Hero's Journey is in literature. This is supported by the guidance to compare similar themes across different texts as well as encouraging the recognition of the Hero's Journey events within them. Furthermore, the author discusses not only the prevalence of the Hero's Journey but also the insights gained by examining the nuanced differences in how various texts employ the Hero's Journey framework to contribute to our understanding of cultural narratives and conflict in literature.