I'm not sure if you mean WordPress.com or are you talking about a self-hosted installation of Wordpress? I've used both, although I have more experience with self-hosted Wordpress.
Assuming you mean Wordpress.com, you'll get the most out of it and build a better audience if you treat it like a social networking platform. Think of it like Facebook with special capabilities. ;-)
Blogging in general is a community activity; the best bloggers know how to leverage the social part of writing and involve other people. It's taken me a long time to learn this, and I'm by no means an expert.
Follow other Wordpress blogs that have the same topic as yours. Leave comments on those blogs. Friend those bloggers on Facebook, Twitter, Hubpages, etc. Hang out in places at WordPress where people who are interested in whatever you write about also hang out.
Having a good experience on Wordpress is not that much different from the community building that takes place here on Hubpages. Network. The fact that it's all virtual rather than real life makes no difference - it's still a community.