Instead of being concerned that you have no office, be concerned to think how you may fit yourself for office. Instead of being concerned that you are not known, see to the (be?) worthy of being known.
与其担心自己没有办公室，不如考虑一下自己是否适合这个职位。与其担心自己不为人所知，不如让自己值得被人所知。
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Concerned
Office
Yourself