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It depends on your niche, if it's related to entertainment then you need to blog frequently like every two days. If it's related to fashion then once a week. Most of the industries are posting 4 blogs in a month. So I think that works well.
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It all depends what you are bloging about but twice a week is okay.You should set up Social platforms so that you could promote your blog always. Social media will help in a big way.