A good strategy for getting hired at a big company is to find an internal advocate. It is easy for the Google HR/recruiter to ignore individual candidates, but it is harder for them to ignore you if they get an email from another Google employee asking about the status of your application.
How do you find an internal advocate? Start networking. Find people at Google with common interests or backgrounds as you. Then send me a cold email introducing yourself. It will take a few months to develop a relationship where somebody will happily send that email to HR for you, so start a few months before you are planning to submit job applications.