If we want to raise up the PR by our own, is there a way of doing so rather than engaging external parties? Any idea how can getting this? Please help if you got the answer.
Write useful and attractive articles. Article is king. When your visitor find your articles useful and also enjoy reading them, then they will provide you natural backlinks. This is the most powerful backlinks. By this you will get PR.
The most important thing is having a good and unique content that can attract visitors. Then use methods like forum posting and blog commenting to get backlinks because quality backlinks help to increase PR.
You will have to write a lot. Articles, reviews, etc. You can also submit your site to directories and have some forum posts. Backlinks are the key to the good PR and I would recommend to do it by yourself. Buying backlinks can be dangerous, you never really know what are you getting until it's done. Just a thought!
You need lots of backlinks, and time. PR takes a long time to update. I recommend building backlinks by lots of forum posting. BTW PR is just a number, forget about PR, and focus on SERPS!
Write content that other site owners are willing to link from their sites. This takes time but eventually you will receive consistent traffic.