If you are getting NPCs above what you are able to pay, then you cannot ED as it’s binding. If a school says your cost is $20k and you apply knowing that, then you’re stuck.
Assuming you are a Junior as you’ve missed many EDs.
What is your family income ? Is Questbridge a possibility ? Your family income should be $65k or less I believe. I’m guessing given your NOCs it’s not possible but worth an ask.
Since you go to a private academy and are rural, talk to your counselor about success stories. They likely have great insights.