Think about how people looking for that information are going to search for it. What might they type into Google? Use those phrases as subtitles throughout your text. So for example if I am doing a hub on coconut oil - I might do a search and see people are looking for the phrase "how to use coconut oil" or "where to buy coconut oil" or "health benefits of coconut oil" .. In my hub I'll do sections about all of those things - using those search phrases as subtitles for those hub sections. This makes your hubs more search engine friendly and more likely to be picked up in results.
Also, pinterest friendly graphics are an amazing tool. I design custom graphics for every hub that says what it's about and has a visually striking or appealing photo and sometimes even a teaser to get people to want to click. Sharing on Facebook, Pinterest (but not spamming!) the image will show up and intrigue people to click.
If your hubs are poor performers tweak with a good pinterest friendly image and make use of good subtitles.