maybe you can try playing during daytime? I found that my KDR is normally better during daytime - maybe due to not so many pro players around coz they need to work or the ping is better during working hours.

another way is to stick to squad that has good teamwork. If after i join a squad i found that most of them are sniping camper, i will join another squad who rush. Coz during close combat, if you are alone rushing, chances are you will die facing an enemy squad who can take you down so easily. Unless of course you yourself want to snipe then you should join the snipers and happy sniping. It is good way to improve your KDR too.

just my 2 sen, my KDR also not good coz always dies in disarming M-COM.