If I want to climb in this game

I have to play like..... 3 champs. And only those champs. But it gets so goddamn boring after a while. How do you combat the game becoming stale in this situation? Like.... if I played nothing but Jarvan, Sejuani, Amumu I would be gold by now. Easily. I have 55%+ win rate on all these champs. But I get so tired of playing the same thing all the time. Look at my match history. This is what happens when I play my main champs. Basically freelo. Pubstomp all day. But its so damn boring. Do you have any strategies or things that you do to avoid getting bored on your mains?
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