Keywords in top 5 position?

Hello Friends,
I have been working on one of the SEO project from past few months and by working consistently on this I had achieved my first target that is to bring all the keywords on top ten position but now I am focusing to bring these in top 5 position and some of the techniques which I am using are directory submission, social bookmarking, forum posting, blogging, article submission etc., Still by using all these techniques the keywords are not yet stable on their position for example one of the keyword was on position 4 and now it has dropped down to position 7. Please suggest some techniques which can be helpful to bring all the keywords in top 5 positions and make them stable.
Thanks.

Keywords position always fluctuate. So do what you are currently doing. Just make sure you build more back links through high Page Ranking unique domains for your specific keywords.

I think you have to concentrate on forum as well as blog commenting. Because both techniques helps you to get back dofollow back links. When you will get back links then your keyword automatically get ranked in Google.

It actually depends on the keyword you target. From my experience, top 5 positions for obviously lucrative keywords are occupied and there's little you can do about it.