people are too obsessed with their teammates
it feels like there's a lot of people where all they can talk about is their teammates. about how they can't carry them, or they need to herd them to victory, or outright seeing people on their team as an obstacle to their success. then they unironically talk about toxic behavior.
stop being so obsessed with what other people are doing. instead of worrying so much about what other people are doing focus on the one player you CAN control. all you need to do to win games is play your best. a positive attitude, humility, and self reflection go a long way in ranked. if you are as good as you think you are you will win games and go up in ranking.
if you aren't... well you can keep blaming others, but don't be surprised if you don't go anywhere.