Let's face it, employers pay for people who produce results. Very often, that's someone who has a unique skill or talent that goes beyond what "most people" would offer.
In other words, you can be the best team player there is, but if you don't have expertise, you're not that valuable. If you're not that valuable, you may very well find yourself looking for another job.
But, don't overlook what could be an obvious void in your resume. For success, determine what you can do to increase your value by boosing your expertise.
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