The possible reasons why I have lost all my rankings

1. I used the same video in two different posts.
2. I used the same image in two different posts.
3. I used 2-3 different keywords in each post
4. As my posts are usually 1000+ words long, I used too many H2 tags (6-8)
Also I included my keywords in some of these H2 tags. For eaxample, if "Panasonic TC P55GT 30" is my keyword my H2 tags follow like this:
Panasonic TC P55GT 30 picture quality
Panasonic TC P55GT 30 3D performance
Panasonic TC P55GT 30 Design
Connectivity
Internet/ Smart TV
Pros and Cons
5. I don't use H3, H4,H5,H6 tags in my posts
6. I don't type my keywords in Italics or bold.

7. At the bottom of each post I link to 6 Authority sites in my niche.The links are placed automaticaly directing to the same sites all the time, not to the different sites each time.
8. Whenever I wrote a post I submitted it to about 15 popular Social bookmarking sites with the same title and description.
9. I uploaded two of my articles to 8-10 doc sharing sites with my links inside
10. I created a squidoo lens including 6 links targeting to the different pages in my site
Yesterday I asked Google to reconsider my site.
Which of the stuff above should I change before they reconsider?

I will be very grateful, if you help