How Am I Supposed To Climb Ranked?

I have played league since mid season 6 where i got placed in silver 5. After playing for a year and a half, and looking back at the last season I realized that I definitely should not have been placed there (I was pretty bad). I went from worrying about winning lane and getting a good kda... To... knowing that I need to affect the game in a positive way by winning lane, and warning my teammates about where everyone is on the map (the enemy team). If that means getting ganked and letting the jg get the kill or me just straight up getting a solo kill. Then I know that I need to affect the game in another way if it is buying some pinks to give my team vision, or ganging not to get them a double, and then taking dragon if it's possible. I've went from what's a minimap to better check this baby every few seconds. To sum all that up I've basically improved from a killing toaster, to a mentally smart and decisive player. I learned the true way to play ranked is to go for towers and objectives, and to not worry about who gets the kills as long as the fight is won(this isn't necessarily true). The weird thing is that I'm unable to climb out of silver 5. I figured out that in any tier division, the V is always the place where the terrible players are dumped because they can't de rank. Instead of me being a toaster I'm playing with them, and no matter what, even if I get fed, from me or the jg and distribute kills to my teammates they will always go for the 1v5 pentathol outplay. Even if they let me start shot calling they won't listen and will throw the game by fighting a 3v1 in our favor with no vision of the rest of their team. How do I win this?!?