I didn't realize all fireflies didn't tend to synchronized. Fun read. Fireflies are one of the only "bugs" from the south that I miss. Cicadas, I suppose, have a bit of a soft spot with me. Everything else... nope.
How far north are you? We get them around Albany, NY. The big thing is having a forest-meadow boundary, where fallen leaves aren't removed. If you're surrounded by grass lawns & concrete where people rake & remove the leaves fireflies could lay their eggs in, you won't get fireflies.
what area are you located in now? We have fireflies in Michigan, cicadas as well
Cicadas are so bizarre. A couple of summers ago I was around Des Moines and Ames, IA and was completely baffled by the strange noise that seemed to be everywhere and yet impossible to localize. After a few days I heard someone talking about the cicadas and learned something new!