Possibly your biggest problem is not working on your dream recall before attempting to lucid dream with various induction techniques. You need to get to a place where you can recall at least 2-3 dreams every night, and are regularly writing them down in your dream journal. People seem to greatly underestimate the value of the dream journal. You have to crawl before you can walk. So concentrate your efforts on improving your dream recall, I'm not going to give you tips on that, as there is a wealth of information already available in the tutorial section and elsewhere on the forum.

Also, it would help if you explain better what exactly you are doing when you RC, WILD, MILD, etc...that way people can tell you if you are doing things wrong, or what you can do to help your chances of getting lucid.