In your rough draft, you thoroughly describe Achebe's portrayal of cultural conflicts in general, providing insightful observations and some well chosen quotations relating to conflicts relating to British colonialism, the Nigerian military, and religious differences.
Narrow your focus to examining Achebe's portrayal of one type of conflict in his novel, such as colonialism-based conflicts or military conflicts or religious conflicts throughout your final draft. For example, if you decide to analyze religious conflicts, you could focus on conflicts such as the Igbo tribe vs. the British colonizers in general, as well as more individual religious conflicts such as Okonkwo (who practices a polytheistic religion in accord with Nigerian tradition) vs. his son Nwoye (who converts to Christianity) and Okonkwo vs. the British military. I also recommend that you begin your three body paragraphs with direct responses to the questions posed for this assignment (specifically mentioned on the proposal sheet, which I am attaching to this message), such as why you chose your specific topic, Achebe's possible purpose for focusing on your selected type of conflict, and your potential target audience groups for your essay that could be especially invested in learning more about this type of conflict.
A few mechanics/conventions-based suggestions:
Mention Achebe's full name the first time you mention this writer (specifically in your second sentence in your introduction).
Consistently italicize and capitalize all words of the novel title, specifically as Things Fall Apart.
Try to include direct quotations (such as quotations by the narrator or characters such as Okonkwo) in your body paragraphs.