At this point i'm close to giving up on league

I know there are a lot of posts like this and most cry about the meta or op champs being their reason to quit. Mine isn't any of those but the current ranked system and its population. I don't know what it is but it really feels like this system is actively trying to keep you from ranking up. Every single game especially in promos there is atleast one going 0/10. Look at my last swain game or GP game i lost. What am i supposed to do except having 70-80% kill participation, most gold, cs, up to three times more dmg than the "carries" of my team and i still lose because they are just dieing clueless as if they just finished tutorial, yet they are the "top" 2,5%. So many accounts i look up with their first season being diamond 5 yet sitting at 40% winrate in mid to low plat. How are these clearly bought accounts not banned? How are jungler in the "top 2,5%" of the ranked population without understanding that you play around champs like jayce, riven, ryze? Since they will singlehandedly carry you the game? Instead they camp ashe/janna botlane. Why? So they have one more zeal? Will that carry us the game? Certainly not when mentioned champs spike hard with only an item component or 2 completed items being their biggest powerspike oneshotting everyone. I got into plat with a 70% winrate and from then on i begun to lose more and more games which just felt unwinnable. Yes i have bad games as well, shit happens but mostly due to jungler intervention because i legit don't know what to do when every 50 seconds a lee wardhops over the raptors, kicks me into the enemy and i die with no possibility to do anything. Noone is helping with the vision, i can't tell how often i died to roams from the enemy support because botlane doesn't seem to bother warding the river. Unfortunately riot thought it is good for soloQ to make my vision game dependent from my teammates.

Yeah basically that's it. I know i will get downvoted or getting comments about how it's all my fault but i don't think a teamgame should be played 1v9 and when someone reaches a certain higher level he should atleast know the basics but currently it feels like one half is legit diamond level and the other half is silver. I started this season in silver 2 and i legit had better teammates macro and micro wise in silver and gold than in plat.

So yeah that was my rant.