There are so many college access organizations in many cities, easily identifiable via a google search. ScholarMatch is a large one that is nationally based, but there are thousands of these organizations, most local.
Check into those and support them either with monetary contributions, or by volunteering as a college counselor. Many posters on CC have enough knowledge to take on a student or two. That’s it for my volunteer-to-help-a-low-income-student-through-the-college-admissions-process soapbox today 