Now a Days Off-Page SEO techniques such as link exchange, forum commenting, social media engagements etc. If these not significant anymore, then please suggest some effective off page techniques.

Here is some best off page SEO activities see the bellow:

1. Guest blogging
2. Broken Link Building
3. Create compelling infographics
4. Improve Your Social Media Signals

The best off page techniques are:

Guest posting
Article submission
Press release submission
Social bookmarks
Classified ads
Infographics submission
Social media optimization

best off page techniques that helps to increase ranking and traffic:
social media
bookmarking
guest posting
blog commenting
article submission

Forums posting
Article submission
Guest posting
Infographic
Social bookmarks

Classified
Social sharing
Social bookmarking
Microblogging
Forum submission

1. Forum posting
2.Video sharing
3.Infographic Submssion
4.PPT Submission

Off-Page SEO Techniques:

1.   High-quality content promotion
2.   Social Media content sharing
3.   Repost your old post
4.   Blogging
5.   Repost old blogs
6.   Guest blogging
7.   Social bookmarking
8.   Infographic submission
9.   Forum posting
10.   Blog directory submission
11.   Classified submission
12.   Business listings
13.   Podcast review
14.   Giving Testimonials
15.   Referral Links
16.   PR articles submission