First off my D19 went from a 30 to a 34 on the ACT. It is possible. No outside help.
We are in IL too (Chicago burbs). D19 ended deciding on MiamiOH. Plenty of merit, but the hurdle was getting a 33 or higher.
Look at MO S&T. She had a good offer there as well. It is STEM school.
Best advice get the ACT score up. Then look for places that give big merit.