Eggplants (like tomatoes) are self-pollinating. So it's not a matter of bees not being around. As it is for tomatoes, a simple strategy is just to flick your finger at the blossom to shake pollen from the male stamens onto the female stigma within the flower. Do that every so often. There are more aggressive techniques that has one physically rubbing a stamen against a stigma. DO NOT do a strategy where you pull off one flower and rub it on the other. Why? Because EACH FLOWER is a potential eggplant.

I am told that hot and humid conditions aren't conducive to eggplant pollination, but I live where it's hot and humid, and my eggplants never have trouble doing so.

Because it's florida summer. get new plants and put them out now.

Look into Asian/long varieties of eggplant if you like them...they tend to tolerate hot summers better.

Sometimes eggplants also shut down in hot weather. Also, if you fertilize them too much they will abort fruiting and instead grow foliage. I Only grow Japanese ICHIBAN. They like cooler weather better than hot.

Another thing, they like more water too.

My personal experience is different. For me, Ichibans are very heat tolerant. When the rest of my plants are shutting down in the 100F+ heat, those Ichibans are flowering, fruiting, and looking quite happy. By far, the most heat-tolerant of my crops.