You are in good shape. You have FIU with full tuition covered (Bright Futures) and the Pell grant to cover any other costs. You can go for it at UMiami and see what you can get. You should also make sure all those AP/DE credits will be accepted at Miami because if not, you’ll have an extra year of college.
Call the Financial aid office at U Miami. They will tell you what’s even possible, like extra financial aid from the school, how high the merit aid can be, what other scholarships or aid are available.