You can't solve a problem without identifying it. Similarly, you cannot improve something without identifying what it is lacking. You need to step back and take a serious objective look at your work and identify its weakness. Otherwise you will end up trying to fix something that is not broken.
Looking at other's photos and determining what specifically it is that you like about them. Now you will realize that everyone's style does not suit everyone's eye. So find photos you like and analyze what aspect of them appeals to you.
BTW, realize we are surrounded constantly by some really good photos. Don't bother with Flicker or your contemporaries work. Simply look at a high quality magazine. Try Rolling Stone or any back issue of Life. Don't ignore the ads. There is some incredibly good photography there.
Just don't go stabbing at shadows in the dark hoping something good will come of it. That will just lead you to frustration.