Also, a program like YYGS will not be helpful to your college application. It may be a good experience for you, but it is a pay-to-play program and will be viewed as such by admissions. It doesn’t help an applicant stand out.
SAMS At CMU is different. It is fully-funded and far more selective.
Even so, any of these colleges like CMU’s CS program with acceptance rates under 5%, will be looking for intellectual curiosity that is pursued in unique, even self-directed ways. I don’t know CS well enough to give specific suggestions, but consider your application in the context of ones that will have identical stats/demographics, and think of ways that you could positively stand out.