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Duranta plants bloom on new growth, so pruning could help the plant rejuvenate its blooms. A 15-15-15 fertilizer, applied according to package directions, is recommended to promote blooms during the growing season.

Duranta is a tropical plant and will not survive an Ohio winter. However, you have some options including bringing it inside if you have a large container. Here is this website's info: https://www.gardeningknowhow.com/ornamental/flowers/duranta/care-of-duranta-plants.htm

In your area, they are treated as an annual. They will not survive a frost. You may either bring them indoors, or let them die off outside. It is always best to assume that deer and rabbits will eat your crops. There are things they should not eat, that I have witnessed them destroy. And ,lastly, they will grow about 10 feet tall! Here is an article with more information: https://www.gardeningknowhow.com/ornamental/flowers/duranta/care-of-duranta-plants.htm

It could be that they need some fertilization. Use an all-purpose fertilizer at least once per year. It could also be a pH issue, which can be solved easily with some dolomitic lime added to the top of the soil. Here is an article for more information on their care: https://www.gardeningknowhow.com/ornamental/flowers/duranta/care-of-duranta-plants.htm

Spots on leaves and leaf drop are usually signs of an infection. This could be fungal, bacterial or even viral. Here are some helpful links

https://www.gardeningknowhow.com/plant-tproblems/disease/plant-leaf-spots.htm
https://www.gardeningknowhow.com/plant-problems/disease/bacterial-leaf-spot.htm
https://www.gardeningknowhow.com/plant-problems/disease/black-spot-fungus.htm

Duranta Golden Dewdrop doesn't necessarily need to be pruned, but it does get quite large if it isn't pruned, and pruning can improve its appearance:
https://www.gardeningknowhow.com/ornamental/flowers/duranta/care-of-duranta-plants.htm

There are many options for privacy screen plants for Florida, that can hide the view of the storage lot. The following articles will provide some options:
http://craven.ces.ncsu.edu/files/library/25/Plants%20for%20Screens%20and%20Large%20Hedges.doc

A row of clumping bamboo might be a good option, because they don't need to be pruned. Clumping bamboos are the types that don't spread underground- avoid running bamboo varieties, because they do spread aggressively and require a lot more maintenance:
https://www.gardeningknowhow.com/ornamental/foliage/bamboo/caring-for-bamboo-plants-in-your-garden.htm