The primary thing potential employers are looking for is experience. Certifications make you stand out on a resume, but generally experience and accomplishments are what really sells a resume so you can get to the job interview. There are a lot of mixed architecture environments, so knowing at least Windows, Mac, and *nix is a big plus. If you're not lucky enough to land a Linux only job, then you'll probably need to have other OS skills.
It seems that you don't have a lot of IT experience. See if you can find an IT shop that supports the most common architectures. A college/university is an excellent choice. Another alternative is being an IT contractor. The pay is usually not as good as a steady salary job, but you get a lot of varied experience.
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