Knife's edge in ranked

(Gold IV Angst don't like don't read >.>)

I'm stuck on a knife's edge in Gold IV now.

How did I even get to Gold IV? Well I started in Silver like an other AVERAGE player did. I loved Morgana. She was so fun to play so she became my most played champion. Playing her 171 out of my 278 games. (Winning 103 of those and losing 68 for a 60% w/l ratio on her). But then I hit Gold. Now Morgana is either banned or picked by someone else everygame. I'm not exactly falling off the board because of it. But I've been to series for Gold III 3 times in the past week and I fail every time because I cannot get Morgana. But once I fail it, my mmr lowers and I'm back to being able to play Morg again.

What am I to do? I suck with every other champion.