<p>^ITA GPA is not the end of the matter. However, for UF and FSU, they received tens of thousands of applications, which is why they can’t really consider other factors than scores and GPA (unless these “other factors” really stand out, ie., football or such). Please note also that your brother ranked in the top 1% nation-wide - another factor we don’t have for OP. Anyway, due to volume of applications, the GPA+scores is the way large public universities function for most applicants. So OP may be better served looking at LACs and private universities with holistic admissions, especially those in the regions cited above, in addition to in-state public universities where his/her GPA is within range.
I also agree with happy1 that OP should use Naviance if his/her high school has it, in order to see where other students from his/her HS go with a 3.4.</p>