1. Do you have enough money saved up to go without a salary for a few years?
2. Do you have generous parents that are willing to fund your pursuit of your dream?
Go volunteer as an unpaid assistant at your local junior college. If you do well, someone might make a call to get you a volunteer position at at D3 college. Continue to do well and you might get a grad assistant position at a directional midwest college with free classes and enough money not to starve. continue to progress and they will give you give you some obscure title and job with terrible pay, but at least you will probably get health insurance. Find the coach in the program that is the smartest, and make it known that you are willing to move anywhere in the country to follow his career and would like to be considered for future positions.
If you and your parents are not indepndently wealthy, I've a had a lot of "normal" friends end up in various athletics support roles like ticket sales, groundskeeping, gameday logistics, and concessions management without having to work for free for a few years to get their foot in the door.