did you try dream pillows? certain smells can effect your dreams. certain food as well, my friend eats cheese when she wants to remember her dreams. personally i avoid cheese, it gives me horrible nightmares.
something i've noticed recently, if you have a tarot deck, sleep with it under your pillow. i use to be told by family who read to place it under your pillow, it not only feeds your energy into the deck, but it can effect your dreams. from what i've seen, my dreams are extremely vivid, old reoccurring dreams, and/or lucid.
keep up with your dream journal, also keep a tape recorder or something by your bed, the second you wake up, grab it and recite what you remember. if you're artistic in any way, sketch scenes you remember [doesn't have to be perfect, just to help you remember items/layout/colours] that another key point, most people dream in black and white and only add colour later. people with strong psychic abilities, or have practiced with dreaming for a long time actually dream in colour. if you have a dream and for some reason a yellow bird [example] really stands out to you, it's because that was the only part of your dream in colour. so you don't have to write in sentences, you could write 'yellow bird' 'cloudy' 'winter' 'sweet smell' little phrases. while knowing more about the dream would be good, it will come later. knowing these things, like a yellow bird, can help you when you analyze the dream.
hope some of that helped. there's many other things you could try, but i'd hold off until you're able to remember more of the dream.