Improve my KDR fast?

Hello, I am making this thread in order to know how to improve my KDR really fast?
So I left Crossfire for a while and just joined back about a week ago. I went to my profile on z8games and my KDR was 0.99!
That is really not what I had expected and I would like to improve it, FAST!
Is there any possible way to do this real quick? I mean any modes or ANYTHING like that which would help me do this.

Also, does the kills actually matter? I mean does it just have to be better than the death in a game? Or Teamdeath match, which gives you a lot of kills than normal S&D modes.
If you know what I mean.

Thanks!