I'm only an average player if that but I'm pretty much in the same boat stuck in Div 8 and can't get out, wasn't doing to bad at the start but gradually getting worse, the game IS NOT FUN every patch seems to make me worse at the game like someone said before If you don't play to the meta you wont win, even the games that I do win I'm not sure if it was me playing well or the server delay or even just the game deciding it was my turn to win.
I collected my **** today and I'm putting it away for a week maybe 2 see what it's like then.