I’m in the burbs of Ft. Lauderdale.
I avoid miami like the plague.
Miami hasn’t had an R mayor in >50yrs.
Miami actually has two Republican congress critters, Broward is the most Democratic county in the state for the past several election cycles. White Gentiles are a tiny minority in Broward (the suburbs of Lauderdale are quite, er, diverse), hence the lack of Republicans in your area.