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Systematically upgrade your existing content: Here’s how (and when) to do it...One of the easiest tactics to generate new traffic is also one of the most overlooked: Updating and expanding your old content.
The benefits of content upgrades
Unlike fine wine, the content on your site doesn’t necessarily age well, with some pieces degrading as time goes on. Creating new content is not always needed when you have a body of good content that can be made to work harder and deliver quick results with some refreshing...
Neil Patel also thinks this is a good idea: How Updating Your Old Content Can Help With Your Rankings