Fresh content always plays a good role so you have to update the content on your pages and you should make the fresh and informative content for the crawlers and your visitors. Another main thing is getting the quality back links, so you should also focus on that, you can apply the following ways to getthe quality back links for your blog:- Press Release Submission and Distribution Article Submission and Distribution Social Bookmarking Social Networking Forum Posting Micro Blogging Blog Posting Blog Commenting Classified Ad posting Craigslist Free posting on Advertising Forums etc. And you can also go for the traditional way like as 1. Link Exchange with other theme base sites an 2. Directory Submission I think it will surely help you to get your pr back.
focus on unique and quality content, comment on other high PR blogs, exchange links with high PR related to your niche blogs, submit your blog to directories like DMOZ, write articles on Ezine articles or similar site, submit your site to search engine (if you don't know how to submit then Check this out), join google webmaster tools and submit your sitemap. Hope this helps. Regards Dilawer S.
Wake up every morning at 5 am, than search for high pr sites where you can sit down your link. Do this for 8 hours from may till april, than at may 1st wake up at 7 am and just do same thing till 10 am PR is a tooth fairy! Whole thing was started for info only. If needed, it can be proved that sites with way lower pr are ranked way over those that do high pr. Getting higher pr is a purpose to what end? Obsession with pr is a waste of time ! Even google shouts that out loud.