Q.eggplant not fruiting
I am hand pollinating my eggplant flowers but they are still not producing fruit. What else can I do? Is there something else I should be doing? I water thoroughly in so I do not think it is a matter of not enough water.
Here are two article to help you with your eggplants. It does sound as if you have down exactly as you should be doing.
Read through and see if you can pinpoint anything else you could change.
I have had very good success with a combination of fish emulsion, light application once a week, and I also use Epsom Salt sprinkled around the base of the plant and water in. I estimate it about 2 tablespoons per plant.
Good Luck.
https://www.gardeningknowhow.com/edible/vegetables/eggplant/growing-eggplant.htm