That sounds like a good start! Next best time to seed and/or plant is the fall. Common blue violets make seeds around then if you want to collect them yourself.
Since you're so close, I say give something on the list a try. Plants don't pay attention to our maps anyway :) There's a search bar at the bottom of the page for each ecoregion where you can plug in the plant name to see if it pops up.
I'm further south than you near the Chesapeake Bay, so hopefully someone else swings by for more specific advice. I do stick by the common blue violet and native wood sorrell suggestion, especially if the area is mowed. Start small and see what sticks, experimenting is part of the process!
That sounds beautiful! Places like Prairie Moon Nursery sell seed in bulk, but it's better to find local sources if possible. iNaturalist can be good for this. You'd have to look up when they go to seed and be mindful not to over harvest.
Personally, I would test the waters with landscapers using common blue violets and native wood sorrels since they aggressively spread themselves. They can handle a wide variety of conditions and mowing.
You can find your ecoregion here: https://bplant.org/regions.php
For example, I'm in the Eastern Temperate Forests. If you are too, this list can get you started: https://choosenatives.org/articles/plant-native-ground-covers-make-america-green/
Maryland passed a bill doing just that:
Same, had one inserted over a decade ago. No one said anything about pain medication. Drove myself home and felt every imperfection in the road. About a week of severe cramping.
Went for the follow up and the gyno adjusted its position without warning. When I cried out, she told me the pain would subside in a few days. It didn't, so I got it removed a month later.
Glad to see the tides are changing 🙌
Direct link to the Maryland bill passed: https://mgaleg.maryland.gov/2021RS/bills/hb/hb0322f.pdf
60 minutes interviewed the photojournalist Philip Holsinger. He says as much when discussing the pictures of them bound, shaved and wearing all white.
If nobody got me, I know Chesapeake Bay Watershed got me 🙏 Can I get an amen?
The above map doesn't include fishing, it's showing land use. This shows fishing:

Here is another one about land animals:

quercus
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Here's some that I use:
BPlant for finding your ecoregion in the North American continent:
https://bplant.org/regions.php
Chesapeake Bay Watershed (DC, Delaware, Maryland, New York, Pennsylvania, Virginia and West Virginia) Native Plant Finder:
https://www.allianceforthebay.org/native-plant-center/
Native ground covers for the North American Eastern Temperate Forests:
https://choosenatives.org/articles/plant-native-ground-covers-make-america-green/
Information on creating soft landings under trees for pollinators:
https://www.pollinatorsnativeplants.com/uploads/1/3/9/1/13913231/softlandingskeystonehandout.pdf
These two blog posts (also Eastern Temperate Forests) are probably a looser fit for the wiki, but I'll share them here anyway. The first discusses why not to be afraid of "aggressive" plants and how to start experimenting. The second has a list of 20 ground covers:
https://www.humanegardener.com/how-to-fight-plants-with-plants/
https://www.humanegardener.com/pulling-stiltgrass/