Well you should certainly try some techniques other than just a dream journal and willing yourself to lucid dream. Dream journals are mostly just for better dream recall and won't induce lucid dreams. Most people I know don't attain lucidity in dreams because of their habits of doing RCs, but because of certain techniques. Stick with a certain technique for a week or so, and if you make no progress than move on to a different one.

A technique I would suggest is Hagart's Induction Technique. (check the attaining lucidity forum) It is one of the easiest techs and seems to work for a lot of people. It will take multiple nights though. You should be trying every night because it takes hardly any effort during the day, and once night comes around you have another chance to try for a lucid dream. You have to sleep anyways, so you may as well expand on your lucid skills while your at it.
Hope this helps/