I would suggest you to write some guest posts on high PR blogs and get backlinks from there.

Increasing pr techniques
 

You can guest post on well established blogs in your niche, You can also buy facebook likes or twitter followers to increase your social network soldiers, by so doing, you always get viewers whenever you write a new post. Also write a call to action at the end of each of your blog post, something like "if you enjoyed this post share it with your friends", once they share, new page views, new customers and maybe future prospects.

Hi,
It's how I like to sell my educational achievements. After a chat with a friend who worked in PR, he suggested it would be a good career in which to express.
As I move from my PR agency work to something more independent, I find myself ... Science shows that bragging blogging is a feel-good form of self-expression.

I you want to increase PR then do high PR Directory and regular updation o your blogs.

Build more and more QUALITY backlinks from blog comments, forums posting, social networks, article marketing, and web 2.0 sites. Point them all to your main website. This will boost your target traffic from search engines.

Get high quality backlinks and get good pr. The more quality backlinks the more faster high pr. Its simple formula.

1. Blog commenting.
2. Blog Posting.
3. Forum Posting.
4. Article Submission.
5. Directory submission.

the reply is very good , thanks " Manjob " ;)

Lots of blog submission and comments or reviews will be good but make sure it's quality content.