Don't stay in the same lane......
Constantly gank. The lower ELO you are, the fewer wards there are and the more possibility of your gank success
Either 1. push your lane fast, down the tower, make it harder for opponent to last hit, or 2. Deny your opponent
3. Play someone with mobility, escapes, or lane dominance. Eg: Tristana, Nidalee, Shaco, Warwick, Udyr, Urgot.
4. Learn the respawn times of the jungle. Tell your teammates when the dragon/baron will be up again. Direct them to there with pings or phrases.
5. Learn to jungle VERY efficiently. Just about everyone can play a solo lane, but few can support well or jungle well. You have to make sure your team has a good jungler.. ask if anyone wants to jungle.. if not, jungle yourself if you are proficient at it.