If you're not making new contacts every week in your job search, you're breaking one of the cardinal rules. People hire people they like. If this rule sounds a lot like Rule 3, it's because they're two sides of the same coin. Whether you know the interviewers, your job is to gain their confidence and put them at ease. Think about your personal demeanor.
Every little bit helps.
You're going to have to do this again. It's hard to imagine a jobseeker who can be assured the next job will be his or her last. Even if you manage to stay with the same company, you're likely to be reapplying for your own job, or bidding on a promotion. Keep yourself in peak job-search condition by maintaining contacts in your industry, adding new skills and classes to your experience base, and updating your resume at least annually.