You can use marketing strategies like the previous answer suggests but Content is always king. Write good quality hubs and your hubs will thrive both on hubpages and from external searches.
Look at the hub pages Need Help Ask Here Thread https://hubpages.com/forum/2 in the forum you will find a treasure chest of helpful hints and tips.
Participate in the hubpages forums or join the weekly hubmob to get more exposure on hubpages. You can also visit others hub and write comments this will all contribute to more traffic to your hubs.