Psychology argumentative- I do not have a definitive topic

This topic has to be in my field of study or future career. My major is psychology and my future career is to be a child psychologist or a child therapist. This also needs to include a good thesis statement, please. I need a topic that has the potential for a lot of information for that topic. This is a research proposal and I hope the directions that I attached will be helpful. Please let me know if you need any more information. Thank you so much in advance!