USC’s merit scholarships are extremely competitive and aren’t a guarantee for anyone (excepting NMFs, as they receive automatic Presidential scholarships if admitted.) USC DOES meet full need (as FA Office calculates it,) have you tried running the NPC calculators?
Your stats are strong and the SAT Subject Tests complement your interest in STEM, especially as an applicant underrepresented in STEM. I am not as familiar with CS admissions since I applied for pre-med/public health on my apps, but it’s good that you have ECs (internship + game design) that support this interest.
Are you applying to college this year? If not, the Questbridge program is an AMAZING program that makes it extremely affordable to attend schools like Brown, Stanford, MIT etc. with high “sticker-prices.” Even if you are, you’ll still be eligible for your full need to met (again, as these schools define it,) if admitted.
Some CSUs have local preferences for admitting students, take a look at the following pdf: https://www2.calstate.edu/apply/freshman/documents/csulocaladmission-serviceareas.pdf
Are you certain you do not want to go to school outside of CA? There are many schools that have strong CS programs and meet full need.