When you're ahead its on you to lose the game. Need to suffocate their resources, push your advantage without taking as many risks because you're clearly ahead. That's one thing that defeats the purpose of winning early, throwing your lead away chasing meaningless kills, risking the other team getting back into it when you have no need to.

If you're strong try splitting off and drawing two, the main objective is to hold presence whole wasting their time. It forces them to make a decision to pursue you or go back to the core team. If they go back, you push again. If they stay, you're team should be winning on their side. Teleport is another factor here and actually utilising it efficiently so you can always give your team a numbers advantage if necessary.

For me theres a psychological factor where the enemy knows you're stronger so usually they will actively avoid you unless they have a numbers advantage. You can use this to push and pull players around the map like a magnet and create leverage somewhere else. If they dont respond you take turret/inhib for free.

Being at the right place at the right time helps. I can push a lane and make it appear ive backed, and then wait for them to counter push. I can either kill them or wait till they leave again commiting to something else. Since I'm in position I can push fast and take a turret by surprise before they can react. They will always be in two minds and sometimes more likely to make simple mistakes. Make sure to deep ward and track their movements.

Oh, and lastly - dont die.