At this point, you have a few options for your research essay. You could write an argument of definition here, or incorporate an argument of definition into your paper in some way. One question that came up in your annotation is: how do we define the homeless? Is a nomadic lifestyle the same as being homeless? The other option might be to combine a causal argument with a proposal. What is causing homelessness and how might we fix those causes? A third option might be an argument of evaluation and a proposal: which initiatives to help the homeless are most successful and how can we build on those?
That are some options for my paper, I would like for you to try to build my paper around this, the rubric, follow APA and use my sources I have provided. I have an annotated bibliography that I did that might help with the structure.