What should I do when I can't really do anything beneficial in game

I played a game just now where I would up going 9/3/6 as Viktor mid. I usually get these kinds of scores because of my crazy burst potential (I can literally full combo kill someone in less than 2 seconds if they get in my range) And though I DID go 9/3/6, we still lost. Now it's obviously way more complicated than "I'm fed I should've won" but my main question is what do you do when you're fed, you can destroy back line and anything that isn't a tank with ease, but you still feel hopeless since all your efforts seem helpless. The last 10 minutes (more like 15 maybe) were spent with us being shoved in at a disadvantage even though we had a lead, sometimes. No matter what we couldn't get anything done because people constantly shoved us in and won fights. People jumped on me and that got me killed but no matter what I did they constantly had pressure. We couldn't do anything like take a tower (we being my team) because it was too risky to do so. And since that happened the last 15 minutes, and they just did whatever they wanted, we lost. easily. I don't know what I personally did wrong, I'm trying to think of what I could've done better, but I got a lot of kills, punished mistakes, but even though I was "fed" I still couldn't do anything "macro" advantaging, like getting an objective. What do I do in that kind of situation? Was this just a bad game and I have to "accept" it just wasn't a good game, or not? I'm sure something was wrong due to us constantly being the "lower team" and the enemy controlled the map. The only thing I could think of was that I had to stay mid the near entire game because they all stayed mid and shoved it in our throats, and even though our top laner split push all 2 turrets in the side lanes we still were at a disadvantage the entire game. I don't really know what to do and it might be over exaggerating making a post about one iffy game, but I still want to know what to do if something like this happens because I felt totally useless in this game (after game screenshot included