Why did Democrats lose Florida?

Still, to put blame solely on Miami-Dade would be wrong. When all the results are certified, Miami-Dade will have provided the largest net positive gains for Republicans in the entire nation, with over 200,000 votes gained this cycle. However, this only counts for a lost of those 200,000 votes. Joe Biden is currently losing the state by 374,394. Therefore, even if Biden had a net loss of zero votes in Miami-Dade, he would have still lost the state by a wider margin than Hillary did in 2016. Why?