The Some of the most effective Off-Page SEO Techniques are:
1. Forum Posting.
2. Blog Posting.
3. Blog Commenting.
4. Social Bookmarking.
5. Directory Submissions.

Off Page optimization evolves around effective link building techniques like blogging, Directory submission, Article submission, Pdf submission, social media marketing etc...I suggest you that go with social media because social media is effective tool to share your blogs and you can get visitors through that and your organic search traffic also gets improved.

article and blog submission is the best process.

Social signals are relatively new. Your site's ranking is affected by the likes, shares & comments your content gets on social media sites like Facebook, Twitter, YouTube and Google plus.

backlinks from hihg PA & DA,download MOZ bar app for your browser to check PA & DA for the sites you interest

SEO Off page activity.

Article submission
Classified submission
Bookmarking submission
Directory submission
Business Listing
PPT sharing
Images sharing
Video sharing
Forum Profile creation

The New Effective Off Page activities that might bring out some results are

1. Guest posting

2. Broken Link Building Method

3. Submitting and getting Signature Links in the form of keyword based Link