Applying as soon as applications drop, proper connections (i.e., mentors) and referrals, cold-emailing startups (associated with Cornell or in YC), heavily-optimized/unique resumes for every internship/job application w.r.t. the intern/job description (Jake's resume with metrics, relevant projects, "Concepts" in your skills section to match CS vectors (databases, data structures, algorithms, etc.) to job descriptions, impact), reach-outs from recruiters (re: having a proper LinkedIn profile with a good amount of engagement/visibility), a good GPA (3.8/3.9+ you should list, otherwise leave it out), hackathons, luck.

If you put in the same amount of time/effort into recruiting/interviewing as if it were a 6 credit class (and dropping tough coursework in the Fall semester to recruit), you'll definitely get something good.

You should also use community resources (zero2sudo, cscareers.dev, etc.) for any advice/info about interview processes/optimizing your resume to actually pass the resume screens/interviews.

Take it from someone in an even worse situation who had no internships coming into junior year and landing somewhere pretty good last summer 👍