How to increase your chances at acceptance at holistic review universities

What about the chances for not well off ORM STEM kids who have achieved big recognition in STEM field, but love other activities in politics, debate, research etc besides maintaining very high GPA at elite prep school, and other scores. However kids need lots of need based or merit based aid to attend any college. They have no legacy, not much athelete, and no hooks whatsoever besides just their accomplishments, grades, character and ECs involvement.