I second your applying for College Prep Scholars. Will your siblings be okay while you go to “college application camp”?
Obvious colleges to have on your list would be UMN (Honors), Carleton, St Olaf, Macalester, and Grinnell. The last 3 meet full need.
However, Questbridge is indeed your best bet. It’s like an opportunity to apply ED to 12 schools instead of 1. (ED is a big deal at most highly selective schools - all colleges on the Questbridge list are highly selective and through Questbridge you get a full-ride+ for 4 years. You wouldn’t have to worry about debt or about paying for food or books and you’d even have a job to help you pay for the occasional pizza, not to help pay for essentials.)