Microgame vs Macrogame

I need help. It's quite simple. How do I translate my good microgame into macrogame? Microgame is where I win my early game and laning phase and really shut down my lane opponent. Of course as a result, I get very fed, and this happens quite often after my 1000+ Kat games. But then later on in the game when it comes to actually winning, somewhere I seem to mess up. It happened to me very very many times where I lost games with scores like 20/5. I know score doesn't tell you much but there has to be a way to at least put that to use right? Most of the time these kinds of games just drag out longer and before you know it everyone is full build and me being fed becomes irrelevant. Tips on improving my Macrogame?
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