Give us more details about this. I can´t see any logical reason why your (any) site cannot create(?) backlinks
Please give a details about the work for your website.So that it will possible to give any suggestion or analysis.
So many work done like Bookmarking,Directory,Blog Commenting,Article etc.But no result shown on google ranking.
Bookmarking will not give you backlinks. If you do some high pr directory submission, You may get links.
It's not only hard work that you need by hard work consistently. How much time have you spent doing it? There's no such thing as overnight success when it comes to google as they test your website by time as well.
What kind of huge work you have done please explain us .... so that we can suggest you better .. generally Forum posting blog posting and commenting and directory submition is best way to get backlinks
Write unique article and submit in good article directories, blog posting, directory submission, comment on other relevant blogs helps to build backlinks.
If you have created backlinks with relevant sites than you will get benefit of it let Google cache that ages first.