Question

find the relative clause. if it is nonrestrictive, set it off with commas. if it is restrictive, submit the text without making any changes.
\if you dont consider the audience that youre writing for, you may find yourself without an audience at all,\ the creative writing instructor cautioned her students.

Explanation:

A relative clause starts with a relative pronoun (like "that", "which", "who", etc.) and modifies a noun. Here, "that you're writing for" modifies "the audience". A restrictive relative clause provides essential information to identify the noun, so it doesn't use commas. This clause is restrictive because it tells us which audience (the one you're writing for) is being referred to, so we leave it without commas.

Answer:

that you're writing for