What am I doing wrong here?

Just looking for some insight/constructive criticism here. I've been playing the game since beta, and have gotten upward of gold before now, quite easily. I don't know what's happening, but I can't seem to improve, and in fact, have done WORSE as time has gone. What am i doing wrong? I see the results of my struggles and it honestly just tilts me harder and I really don't understand why. Any advice is appreciated.