I think you miss Infographic submissions.

Two types to get better result in seo. First is on page and second is off page.
In off page create article, blog, forum, ppt, video and other off page techniques

Seo is very important and interesting for website ranking . There are two types of seo

1. on page seo.
2. off page seo.

On Page Optimization includes :

Keyword Research & Analysis
Competition Analysis
Content Optimization
Internal Linking structure Changes
URL Structure Changes
Site-map updating / creation
Keyword URL Mapping
Creation of Meta Information
Title tag (LSI Based)
Description tag (LSI Based)
Alt tags (LSI Based)
HTML Coding, Validation & Correction
H1, H2 & Strong tags
Canonical Issue Check
Error 404 page optimization
Xml Sitemap
Robots.txt
URL Architecture
Google, Bing & YAHOO Site map Authentication

Off Page Optimization includes :

Directory Submission
Social Bookmarking
Blog Commenting
Forum Commenting
Posting Stories in relevant blog websites
Submitting Articles in relevant article websites
Press Releases in relevant press releases website
RSS feed generation and submissions
Review Submissions
Q & A Submissions
Video Submissions (Video Provided by Client)
E-Book Submissions
Social Networking