I'd assume it'd be easier to make up a plan, while having some good credentials, and ask the gov't to let you turn some of that unused land into a wildlife preserve. That's my guess, but I'm sure their are non-profit groups around that do similar things.
Wildlife Habitat Incentives Program (WHIP)
WHIP is a voluntary landowner program that is devoted to the improvement of upland wildlife habitat. It is available in all 50 states and has enrolled nearly 11,000 landowners totaling 1,600,000 acres (6,500 km2) since its beginning in 1998. Eligibility is limited to privately owned, federal, tribal and government lands (Limited)
Just down the hill from us is the Cuyahoga Valley National Park. It was established in the 1970's. I remember the valley before it became park. Lots of houses, a number of really vicious nasty toxic waste dumps, many businesses along the river (including a paper plant) and everywhere well lit at night. You couldn't fish and keep in the river unless you wanted to grow extra parts. It was a (once beautiful) mess.
Now, years and millions upon millions of federal dollars later, the buildings are gone, the lights are gone, the dumps cleaned up, the river is no longer polluted, the noise of daily business life is quieted. The herons, coyotes, beavers, eagles, turkeys, turtles, wood peckers, mink and even occasional bears are back. The beavers have transformed hundreds of acres of once dry farm land into beaver "swamps". The Park has even removed some not native trees, so more "original" trees can flourish. The waterfalls run free. And the few remaining farm fences, in now deep woods, rust away. Each year it becomes increasingly difficult to tell where the friends of my youth once lived. All quite the change in just a partial lifetime.
Even our town is transformed. A hundred and fifty years ago, we used to be able to stand on our barn bridge and see the town center a mile and a half away. Now it is all woods as all the other farmers have quit tilling and got easier city jobs. I have planted thousands of trees, but most of the woods around us now have replanted themselves simply by being left alone. It's so different now it has become hard to place where old family photographs were taken.
So, what you propose is possible. Remove the "works of man" and nature will have her way with a place. But it generally takes time and money and desire to do. The acres across the road from you could host lots of life, not generally seen in corn fields and tract house lands. It's not anywhere large enough for a bear, but you could have butterflies and birds and small animals not common to many "used" places. Good luck. What you dream of is Gaia's and God's work.
...P.S. We host wwoof'ers and have an intentional community in our corner of green Earth. If you visit our permie profile, readers can find us and maybe someday come for a visit.