Hey, I don't have too much advice, but from what I've experienced it's essential to be clear on why you're interested in school psychology vs. clinical or counselling psychology, and what aspects of the school psychologist role appeal to you. I would recommend reading NASP's description of a school psychologist if you haven't already. Dissect the role into its different parts (assessment, intervention, consultation,etc) and choose examples from your work/school history to illustrate why each excites you. Hope that helps! Good luck!