"Never zero" in the context you provided means having a consistent, daily practice of meditation and making it a non-negotiable part of your daily routine, regardless of how tired you may be or what other challenges you may face. The phrase suggests that you will not allow the number of days you meditate to be zero, or to fall to zero, and that you are committed to making time for meditation every day.

I suggest you put the Persian translation in quotation marks in the target text.