How to win Game after Winning Lane?
So with the new ranked season upon us, I'm already 0-5 in my placement matches. I started playing league about 10 months ago, and when I did my placements in season 5 i went 1-9 and ended up in bronze 4. Yes it was bad, but over the course of several months I improved my gameplay and got all the way to Gold 5 promos, which I lost unfortunately. Still, others may think that is bad, but Im proud that i got all the way to silver 1 in less than 8 months of playing this game.
Now to ask my question, I main mid lane and in my last 5 placement matches, I won my lane hard 4/5 times, there was only one game that i lost my lane and that was due to miscommunication on my part with my jungler.
My game scores went as follows: 5-6-3 (this is the game I lost lane) 9-8-7 ( I won lane hard at the start but then I got massive jungle pressure) 10-8-8 (playing katarina against a low cc team, but every lane lost other than mine so i started making some desperate plays to try to win teamfights, ended in my dying a lot) 22-9-10 (absolutely demolished my lane as Talon, but our ekko jungle tried to invade enemy yi repeatedly and fed him 7 kills in less than 15 minutes, our team was relatively low cc so yi ran wild and I couldnt oneshot because of his meditate) 11-6-9 (won my lane as Draven adc but my team kept chasing enemies leaving me to try to 1v2 the braum and udyr who kept duo pushing, didnt end well)
I realize after typing this out that my biggest problem is map awareness, most of my deaths were incurred from seeing an opportunity to go ham on my opponent without realizing where the enemy jungler was. Ive been working on checking my minimap after every 1-3 cs, but its a hard habit to get into.
So what should I do, as a mid laner, or really any lane, to bring my advantage into other lanes? Ive tried two things: First I tried to roam more but this leads to me losing out on quite a bit of cs, and if the gank doesnt work out I just fall behind. Secondly Ive tried to be a shot caller and explain to people what our strategy is based on the disparity in strengths between our teams and what they excel at, people do not like to listen that much, though.
Im not trying to claim to be a god at this game or that i deserve diamond, but I really do not want to lose any more placement matches and get stuck in bronze again when I know Im good enough to be high silver/ low gold.
So any tips everyone has would be much appreciated.
tl;dr How do I win a game after winning my lane? I win my lane 9/10 times, even if its just a small advantage, but cannot seem to win any of my placement matches, so any tips you guys have would be awesome!
Update: Won one game and lost another, won the game with garen ( its so much easier to carry if youre playing a bruiser or tank) then lost another game as talon. I went 9-4-14 as talon but still lost because enemy team got a nice wombo with miss fortunes ult leading her to get a quadra and ace. I need to learn how to close games faster when ahead.
Update 2: Ended placements 2-8 and was placed in bronze even though I had a 4.0 kda through all the games, lovely.