Ranking system

So i have been playing league on and off for at least 5 years now and honestly thinking of never playing ranked again. I just finished my provisions and got bronze 5 again based on 4 to 6 losses, even though in the 6 losses I finished with a A rank or higher. So this rank system is defined purely on wins and losses nothing else, so if your team feeds or doesn't group up to push objectives you are punished. I honestly don't know how one single person can carry four terrible people no matter how good you are. So riot you need to re-look at your system because it blows, I understand its a team game and all, but why i do i get punished for doing the correct thing like getting a kda of 19/9/5 and knocking 3 towers down with 3 dragon kills in a game with people that cannot even comprehend the very basics. It shouldn't take the skill of a master to get out of bronze because most of your team are trolls or people who aren't even use to playing a champion or specific lane.