How do you play when you're ahead?

I'm on a 5 game loss streak, and we hard won bot lane in 4 of them. We take tower, rotate, etc, just to have a Nasus with 300 stacks in the 17th minute 2 shot our fed adc. In other games the team just ends up getting caught and we throw. It's really annoying when for 4 games straight you're so much ahead on lane that it seems like the victory is guaranteed, but then you and your team end up throwing in all of them. Any advices please? I feel like I have a way better win ratio playing from behind than playing with an advantage, because the team that's ahead is usually just going to throw 80% of the times. {{sticker:sg-soraka}}
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