I have a couple of suggestions for this.

1. You can 301 redirect the pages/posts that are low-quality to higher quality/more relevant pages, or you could even decide to rewrite the topics to update them in a new post to improve the content and then 301 the old posts to the updated content. If you decide to 301, you should make sure to use a rel=canonical tag so Google knows what pages are the right ones to index.

2. You can also recycle your high performing content into new posts. For example, if you had a post that was 10 Best _____ for 2010, you could rewrite the same post now, updating any neccessary info, and name it 10 Best _____ for 2017.

Hope that helps some. Let me know if you have any other questions.