Link Building... Link Building... Link Building... !! Quality link building gives quality traffic and good page rank for your site. - Jopson
The answer is so simple. To get a high pr you must get a high pr link from the same niche that you have.
Well, well. So many people have already pointed out the ever so important advice of getting high quality keyword rich links from niche sites. I will add my 2 cents. Also don't forget about giving links. Give links to related niche sites and build your community. Build some credibility and it won't be long before they would start linking back to you.
Linkbuilding with quality websites based on similar themes will help you get a good google page rank. Google search rankings fluctuate a lot. keep doing onpage seo for your sites on a regular basis to stay in better rankings.
Aside from this, to increase your PR naturally, it's best to create a unique and useful content so that more sites will naturally provide a link pointing to your site because they find your resources useful to them.
the above are all to pass over, and I tell you the truth: to link with me... ---------------------------------------------------------------------------------
abrilward is right namrata, there are no fixed positions. If there were, then you yourself would have no chance to move upwards. But there's light at the end of the tunnel. All you have to do is consistently build links. Do something every single day to build links. Even if your site has poor or average content, links will generally overcome that shortcoming, but they can't make people buy from you.