I have been working on a university website and now I have come across a keyword which is highly competitive and what so ever I do for creating good back links is going in drain. Its ranking is in 500's since the day i took the charge to optimize it. I have been doing rigorous bookmarking, forum posting, directory submissions, blog commenting also still its not going up. Will article posting and blog posting will give any positive response to it. Its been a month almost i am struggling. Those who have knowledge in it kindly suggest me something good, signatures can be created later also.