You need to make yourself famous using the different white hat techniques of SEO.

I have Design and Development based blog site and its PR is 2 and I wants to increase its PR.Please suggest some backlink technique except using forum and directory submission site and article submission?

Just write good content and keep keywords and help to familiar with google search engine.

For blog: social media, high (unique) quality content and frequent updates are the best way to generate traffic.

Quality does matter the most for content and after that social engagement can help too

I got some useful idea from here. thanks all

Few tips for generating traffic for your blog-
Target Your Content to an Audience Likely to Share.
Participate in the Communities Where Your Audience Already Gathers.
Make Your Blog's Content SEO-Friendly.
Use social networking platforms to Share Your Posts & Find New Connections.
Conduct Keyword Research While Writing Your Posts.
Guest Blog.
Participate in Q+A Sites.

I think:
- write a headline title
- quality content
- share : Facebook, Google+, twitter, linked, reddit, pinteress

to get good traffic, your site have quality content

1) Unique content - content is king
2) Submit your site to google webmaster
3) Use social networking to get more traffic (twitter, facebook, linkedin)
4) Get high quality backlinks

content is king make a quality content

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For blogs i would recommend social media more than seo.