I'm getting better, but I still need to figure this out

Mechanically and consistently, I am playing better with pretty much every champion that I know how to play. But here's the kicker, next season I want to move up from where I currently sit (Silver 3-1 elo), but I find 1 thing still left that I struggle with. The issue I am having is, what do I do when I am fed? Sometimes I just don't know what to do when we are ahead. In my elo, most people just want to continue killing people over and over until the game gets to a point where everybody has items and we have a chance to lose still. How can I get better at shot-calling or finding better uses of my time when ahead? Sometimes I find myself going into the jungle for no reason, then have to snap myself out of it and think "We're ahead, I need to do something." What can I look into to get better at this?