What am I doing wrong mid-game?
In my ranked play I almost always pick yasuo when I get mid. Even when the matchup is in the enemy mid's favor (for example Talon or Annie), I still pick yasuo because 9 times out of 10 I'm still able to win lane. I've become really good at winning lane playing yasuo. If I'm not ahead in kills, it's normally because the enemy mid is playing so safely they're way behind in farm so either way I end up with a gold advantage.
The issue is I never seem to be able to carry on yasuo. I don't know how to transfer my fed laning phase into wins. And my mid game and late game decision making are lacking. When the first tower is taken, a lot of the time I'm the most fed person on either team so I say in chat "Let's group for objectives while I'm ahead." Most times my teammates just continue laning. I don't know what I should do so I farm my lane and try to gank top and bot when I see a chance. If we get a kill, we push to tower and take it. Occasionally, my teammates will group mid with me and we try for the second tier turret mid or in another lane. This often results in teamfights. Eventually we lose a fight hard and we lose our advantage. At that point, I don't know what we should do. That's why I know my mid/late game is bad, because I never have a definitive idea of what our team should be doing at any particular moment. Where can I learn this and how do I improve my mid/late game?
I often feel like I'm in elo hell now. When I have those really good laning phases where I go 5/0 in lane, I feel like I have to carry my team but am unable to do so.
TL;DR I am VERY confident in my yasuo mid lane and in my mechanics on him and almost always win lane with him. But it ends up meaning nothing because I don't know what to do with my advantage and how to transfer that advantage to the rest of my team after laning phase ends. What should I be doing with my advantage in mid game? How do I keep it? And how do I improve my decision making and shot calling in mid/late game? Basically how do I convert my good laning phase on yasuo into wins?