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A soil test and ph test are the only way to know what nutrients are in your soil.
Your County Extension Office can help you with a soil test.
A common reason for poorly growing grass around trees is sunlight and moisture levels.

https://www.gardeningknowhow.com/extension-search/
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/tips-for-growing-grass-under-a-tree.htm

I would recommend a soil test to determine what amendments your garden needs.
Your County Extension Office can help with a soil test.
https://www.gardeningknowhow.com/extension-search/
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-garden-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

Instead of pussy-footing around, I'm sending you to a link where the pros discuss the topic. https://durham.ces.ncsu.edu/files/library/32/UNH%203.PDF
May I reinforce the necessity of a soil test through your local county extension service. Included in the report are specific recommendations for improving your soil.

These links will help you get started!

http://extension.udel.edu/factsheets/delaware-gardening-challenge-to-newcomers/
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-7/zone-7-ornamental-grasses.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-7/zone-7-nut-trees.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-7/zone-7-palm-trees.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-7/zone-7-citrus-trees.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-7/zone-7-evergreen-trees.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-7/zone-7-bushes.htm

If your area has had unusual heat this summer, your plants may just be heat stressed. There's not much you can do about that. If you added a long-acting fertilizer this spring, it may be done and gone by now. Read the label instructions for how long it will last. Of course, if you've had excessive rain, that may cause fertilizer to leach through the soil faster than normal. Late summer plants that can take the heat include blanket flower, calendula, black-eyed susan (especially Ratibida pinnata) and coneflower. Ornamental grasses with graceful seed heads this time of year also provide interest. Or you can tuck a few annuals in here and there to bridge the late summer gap; sunflowers, which now come in all sizes and many colors, nasturtiums, and wave petunias are 3 options.

No need to hire anyone or even seek professional advice. Go to any good garden centre and ask for a soil test kit. The instructions will be clear on the product label. When doing the test of your soil decide what you are going to plant there, and then look for the appropriate ph level required for the plants you are putting there. It will vary from acid, through neutral, to alkaline. It is a very easy process.