Here is the thing. If you think that you should be higher than you actualy are. You need to play consistetly better than average in your rank.
Everyone is having bad games. I'll tell you, you will face 0/10 mid on your side even in higher plat/low Dia. However if you dont flame, do your best to carry those who are behind and punish enemy team mistakes. You will be climbing even with teammates you describes.
There is a lot of guides how to climb, best advice, imho, is that when you lose 1-2 games in row. Get a breake. Play normals, arams or go and do something productive. You will not play well if you are tilted by 2 lost games and that will cause more lost games and more tilted mind set. This will continue until you drop a lot and force you to write on boards (not trying to be dick)
tbh, flamming and chatting in games where you are behind is the reason why the game is lost.
When we are playing flex with premade of three and randoms are feeding. You can see the difference how they play if we start to flame. However if are quiet or typing something like "dont worry about score just farm we will try to carry it". Most of the times these players actualy come back to game and doing good.
Morale is a powerfull tool.
[slayer-jinx-catface]