How can you even try to climb ladder

So i just played a game of ranked. I'm bronze I player trying to get better at the game and climb the ladder. Last 3 games i had a team like in the link. Our teamscore was 43 deaths to 5 kills... i only died 3 times, with the last two deaths way at the end when the enemy was fed as fuck and baron buffed.

Now i'm not claming I had a huge impact on the game. My cs'ing was very bad early and i died once in lane aswell. I made my mistakes and i should learn from them. But even if i hadn't made mistakes and had godlike cs, there is no way i could've ever carried a game with 4 players having an average deaths of 10...

Yes you can report inting players but nothing ever comes of it. I mean what fun is there if you're improvement is always fluked by these sorts of games. It's plain ridiculous that Riot hasn't found a way to counter these sort of games after all these years. These sort of games really take the joy out of playing...

Any thoughts on how to avoid this?