First, write quality hubs on topics that readers will be interested in reading. You can often find good topics by checking Google Trend website. You can also check Ebay to see what is the hottest selling items on the website and turn that into a sales hubpage. Once you write your hubpage, you must choose good keywords to make your hubpage visible in google and other search engines. The keywords can be in your title or in the hubpage itself. Make sure your hubs are at least 500 words long, do not make them too short.
Secondly, get involved in the hubpage forums, answer questions, or even submit questions to make yourself known to the other hubbers. These are main two ways I have increase my traffic since I been on Hubpages and over time the traffic will increase on it own once your hubs get backlinks from other websites.