Duplicate content confuses Google's algorithms more than it triggers penalties. Check how each page ranks: keep what works, delete underperformers, or refresh them. An SEO pro can help you decide which approach fits your site.
Are you worried about duplicate content? You should be. Here's the reason why. It's not so much because Google's going to penalize you and send you to Google jail. It's not that. What it is is that Google gets confused. So you don't want to write about the same topics over and over and over in the exact same way if you already have that content produced. What you should be looking at is, does the content that I've written perform in search? If it does, call it good, move on and do something different. If it's not performing, you need to work with someone like me to decide if you should prune that content, AKA delete it and do something new, or if it needs a refresh or a refurb. Those are things you can do.
