One way to improve the soil is humates. These usually last from 4-7 years from one application (can apply 100 - 400 lbs/acre). They hold water, stimulate biology, break down chemicals, hold nutrients so the growing plants have access to these nutrients, break up clay soils, and many other good things. Global Humic Products out of Sherwood Park, Alberta, CA sells humates - website is
https://www.global-humic.com - They should be able to find a local store in your area to work with. They also have good information on humates at their website. Do you have earthworms in the soil now? Do you have a section of your acreage that earthworms can be introduced? Earthworms will definitely get the soil broke up, pull organic matter down into the soil for the soil microbes to use, and supply calcium, nitrogen, etc. from their castings for the growing plants. Focus on the organic matter and fungi for the soil as this will change the soil for the better - higher organic matter, improved soil biology functions, etc. Hope this helps. Blessings