I had been trying LD, using WILD technique to be more specific, and didn't manage to do it for about a month. Then i tried MILD, as i recalled 3 dreams per night. At the first try i managed to do a MILD. It only lasted a few seconds, but i was Lucid. Another night, I even managed to do a DEILD attempt where i felt some vibrations and was close to achieve a WILD. Now i'm having LDs almost every night although they are quite short ones.

So i think you should try a technique for a while and if it doesnt work switch to another or even alternate em. Eventually you will find the one that suits you best.

Just don't give up. It's worth the effort.