This time of year in Florida is ruff, but toms and peppers should do ok. Generally loss of flowers and no fruit is a sign of good nutrient level, but lack of natural plant hormone (cytokines) or in the case of non self-fertile plants lack of or incomplete pollination. Foliar sprays are a good tool to impart micronutrients and even hormones to help stimulate blossom set and alleviate plant stress. I’ve tried Blossom Set, homemade worm tea and VermaPle. All of which should help.