Use the proposal you wrote as a guideline but remember that you are not bound to the proposal. For example, you may decide not to rely as heavily as on anecdotes as you initially thought.
You will have, of course, already have the introduction and first paragraph done. You will just need to finish the paper.
I am not looking for a traditional 5 paragraph structure (though you are free to write one). Just make sure all your points are discussed in enough depth. If that requires 6 paragraphs, that is okay.