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Look into the plant called eastern teaberry or wintergreen, Gaultheria procumbens. It tolerates shade, is low growing and is recommended for soil erosion control. Spiderwort/bluejacket and solomon's seal, false lily of the valley and wild ginger are other possibilities. Spicebush is a shrub that does well in shade. While getting new plants established, cover the soil with straw or burlap. Additional things to consider are a small swale filled with river rock that leads to a rain garden; thinning limbs from the trees to allow more sunlight; and ensuring downspouts point away from the trouble spot. (There are a number of rain garden plants that prefer at least partial shade.) Finally, consult with a landscaping company to discuss options including dry wells, terracing, and drainage management.

It is hard to say without knowing the plant, having pictures, and a detailed description of the care.

What I can do is give you some common reasons why leaves curl, and won't flower.

If the pH is too high, or too low it can cause leaf curl. You will have to test the pH of the soil before knowing how to correct.

Too much or too little moisture can cause this, depending on the plant.

Too much light can cause it, depending on the plant.

Too much of one nutrient, or not enough of one nutrient can cause leaf curling.

Lack of humidity or too wet, or too dry soil can cause this as well.

Lack of flowering can be caused by pH imbalance, nutrient deficiencies, or environmental problems, as well.

These articles will help: https://www.gardeningknowhow.com/houseplants/hpgen/curled-houseplant-leaves.htm

https://www.gardeningknowhow.com/plant-problems/environmental/plant-not-blooming.htm

Unfortunately, without more information it will be quite hard to pin down what is

That is a severe bacterial infection. There will be no saving it at this point.

When you start over, be sure and use a completely new container, or STERILIZE the one that is there now.

You will need fresh soil, as well. It will be quite difficult to bring the existing soil back to being usable.

Make sure to only water when to top of the soil is completely dry down to about 2 or 3 inches between watering. (That is a general rule, and some plants require different watering schedules)

This article will help: https://www.gardeningknowhow.com/houseplants/hpgen/how-to-water-a-plant.htm

With the dog poop situation, I suggest waiting a year before planting edibles, especially root crops and leafy greens that are more easily contaminated by animal waste borne pathogens. I would use the year to build soil fertility with copious compost applications, maybe from compost you make yourself. Incorporating compost into the soil will help process the manure and neutralize pathogens.

Soil testing and prescription amendments based on actual deficiencies found is a good way to go.

If you wanted to get started gardening right away you can create raised beds and bring in soil for them.

Visit Gardeningknowhow.com, and search under any topic that interests you. Then give it a whirl! Practice is the best teacher! Also check local universities for gardening or horticulture classes. There are tons of books on gardening that you can find in libraries or online. There may be local clubs or societies that further the education of gardeners as well as radio and TV personalities. Good luck!

This can require major reconstruction, unfortunately. I would, first, contact your local extension service. They can help you to make sure that you are following in accordance to the regulations in your state about digging.

This link will help you to find the closest extension service to you: https://www.gardeningknowhow.com/extension-search

These articles will offer information on adding drainage to your lawn: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/yard-drainage-problems.htm

https://www.gardeningknowhow.com/lawn-care/lgen/fill-uneven-lawn-low-spots-how-to-level-a-lawn.htm

https://www.gardeningknowhow.com/ornamental/trees/tgen/wet-soil-trees.htm