Web 2.0
Guest blogging
Article submission
Forum posting

Here are 10 advanced SEO techniques that you can implement to increase your website traffic -
1. Identify All Broken Links

2. Find Superb Keyword At Reddit

3. Discover Effective Keyword From Promising Links

4. Connect To Your Audience By Social Networking

5. Develop Informative Blog

6. Deploy Blog Marketing Campaign

7. Participate In Online Community Of Your Niche

8. Submit Your Website To Search Engine

9. Post Your Blog at Major Websites

10. Promote Your Website With Link Baiting

11. Share Images, Photos & Videos

12. List Your Website In Local Directories

13. Posts Reviews About Business

14. Share Products On Shopping Networks

15. Participate In Question/Answer Website

SEO is ever changing field. So, it's very important to know latest techniques in SEO. Below are some of the techniques which work.

1. Create a website for users, not for search engines spiders only.
2. Try to make your website load faster, less than 2 seconds is preferable.
3. Guest Posting in leading niche blogs
4. infographics with original researched data (not copied from any source)
5. Discussion on relevant Forums
6. Local Business Listing
7. Ask your client to post reviews on your local listings
8. Blog Posting and Web 2.0 Submission

Don't forget about web design. You can try a WordPress theme. As for WP themes, I prefer Monstroid 2. It has more powerful functionality and it's also responsive and optimized. Just have a look at the comparison - X Theme vs Monstroid 2.

social media marketing and content marketing are gaining importance nowadays

Blogging
Forums
Social Media Marketing
Press Release Submission

Latest SEO techniques in 2017 are

Blogging
Forums
Social Media Marketing
Press Release Submission
PDF sharing
Classified Ads

These are great lists of SEO techniques that bring good traffic to our website.

The latest SEO techniques
 

12 SEO Techniques You Need to Be Using in 2022.
Find Your Competitors' Best Performing Pages.
Inform Your Content Strategy Using a Keyword Gap Analysis.
Use Digital PR to Earn Authority Backlinks.
Improve Your Organic CTR Using PPC Testing.
Optimize for 'People Also Ask' .
Steal Your Competitor's Broken Backlinks.

Get ready for more fanfare about Core Web Vitals.
Enjoy the benefits of passages.
Pay attention to subtopics.
Earn featured snippets.
Protect your ground.
Create new content with SEO in mind

What are the latest SEO techniques?
 

12 SEO Techniques You Need to Be Using in 2022. ...
Find Your Competitors' Best Performing Pages. ...
Inform Your Content Strategy Using a Keyword Gap Analysis. ...
Use Digital PR to Earn Authority Backlinks. ...
Improve Your Organic CTR Using PPC Testing. ...
Optimize for 'People Also Ask' ...
Steal Your Competitor's Broken Backlinks.

I would like to suggest that the latest SEO techniques are now going these days

Keep Updating Old Content
Obtain Quality Back Links
Do Research Your Keywords Well
Publish Content On SMO Platform
Improve Page Loading Speed
Create More Video Content
Make Good Website Architecture

What are the latest SEO techniques?
 

Find Your Competitors' Best Performing Pages.
Inform Your Content Strategy Using a Keyword Gap Analysis.
Use Digital PR to Earn Authority Backlinks.
Improve Your Organic CTR Using PPC Testing.
Optimize for 'People Also Ask'.
Steal Your Competitor's Broken Backlinks.

What are the latest SEO techniques?
 

12 SEO Techniques You Need to Be Using in 2022. ...
Find Your Competitors' Best Performing Pages. ...
Inform Your Content Strategy Using a Keyword Gap Analysis. ...
Use Digital PR to Earn Authority Backlinks. ...
Improve Your Organic CTR Using PPC Testing. ...
Optimize for 'People Also Ask' ...
Steal Your Competitor's Broken Backlinks.

You said you have 12 SEO activities but you have only told 6 and also, could you explain how to optimize for 'People Also Ask' techniques?