To increase PR, before you have to increase your website backlinks, so you have to focus on backlinks for this you have to follow some best off-page techniques..i.e.:
- Link Wheel
- Blog Commenting
- Forum Commenting
- Web 2.0
- Ads Posting through Classifieds
- Press Release
- Profile Linking
- Local Business Listing
- Social Bookmarking
- High PR Directory Submission
- Article Submission
- Guest Posting