Okay so I guess this is a bit of a odd idea but, if you remember more dreams (lucid or not) than usual, then reward yourself by having the food you like or having a sofa day etc (the happier you are the better, yes I am implying something here and I hope I don't need to spell it out for you). This way, your brain will make a link between good dream recall and however you choos to reward yourself. After a while your brain will strive for more vivid, and more easily remembered dreams in hope of the reward. It's a win-win so give it a try, I don't have proof that this'll work and haven't tested it myself either so you'll have to report back with results in a few weeks