I know you've put in a good bit of work getting your site how you want it, but my suggestion would be a CMS (Content Management System). Even though you still have to spend a lot of time tweaking the free templates available, you have a ton of options to add dynamic content such as, Most Popular Articles, Polls, News Feeds, Interactive Games, and more.
These are the ones I would suggest looking into.
These free CMSs are getting more customizable every day. You can install extra modules, plug-ins, and/or widgets to make your site more engaging.
They also make creating new pages a snap.