The answer is understatement because he says that he "does not write all that much." This understatement in his short autobiographical essay adopts the same tone found in "There's a Man in the Habit of Hitting Me on the Head with an Umbrella."
An understatement is a literary device that writers use to make an event seem less important that it appears to be.
Hello. You did not inform the excerpt to which this question refers, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
It is only possible to answer this question after reading the excerpt. However, it is important to inform that the theme of a text is the subject to which that text addresses, which is directly connected with the message that the text intends to present. Thus, when reading the excerpt you must understand what subject is being addressed, to be able to find the theme. You can find this subject by thinking about what the excerpt is referring to, what meaning it is trying to address, what lesson the excerpt teaches and how that excerpt can fit into real society.
Hyperbole
If don't know what it means its best to start of with what you do know
Process if elimination.
It's not a simile because it has no like or as.
Its not Personification cause its not giving the object human features.
And its not metaphor cause its not literally Applicable. I'm assuming.
So that just leaves you with hyperbole.