Oddly, here in Taxifornia we've done all the things you say DeSantis didn't do, and our case numbers are going up as well.
Perhaps an increase in testing has led to an increase in reported cases... is that something you would consider as at least a contributing factor?
Also, as HarryKuntz points out, maybe people are just fed up with living inside and staying at home, and want to live their lives, and get our economy roaring again, as only Trump can do!
If those people (me, among them) avoid others in high risk groups, wear the damn mask, wash our hands frequently, and don't touch our face, we should be fine, and greatly mitigate the chances of giving the virus to others.