Answer:
Pick the topic to write and organize his main points or thesis.
Step-by-step explanation:
Essay writing practically involves five major steps, among which includes the following:
1. Selecting a topic
2. Brainstorming the topic
3. Organizing the main points of the topic
4. Writing the essay
5. Revising the essay.
Hence, in this case, Mafus has satisfied the first two steps in essay writing, therefore the next step for him is to "Pick the topic to write and organize his main points or thesis."