Start using a visual evaluation, as this is going to help you if you should get a soil test done on your lawns land or not. You would get little idea about your land by visualizing what all things are missing in your soil.
Also, do not be reluctant to begin feeling the soil. As strange as this might appear, fantastic soil is going to have a specific texture.
Black, loose soil and tons of earthworms could be an indication of healthy, organic soil (assuming you have already tested for dangerous substances). You can also visit https://biosoilsolutions.com.au/services/soil-chemistry-testing-2/ to get soil testing done.
Adding compost ie mulch to your soil can help add nourishment. Obviously, you will want to prevent pesticides and substances which are high in harmful compounds. You're aiming for soil which is quite porous and loose.
Next, be sure to understand the PH level in your land. Based on test results, you will need to be certain that your soil is too acid or alkaline.
Is your soil compacted, using minimal space for crops to find water and air? If that's the case, you might have to use a tiller or alternative gear to divide the dirt. The last step would be to think about doing alterations, or additional fertilizers or nutrients into the ground.