I've been getting bored...

I've been getting bored at this game. Every time I turn on my computer, load up league, and get ready for a game, I feel excited thinking like I'm gonna get a penta! or I'm gonna get an s +! but at about the third game, regardless if I did well, I feel hesitant to start another game. I start thinking, well I might as well play another. I often stop playing way earlier than I usually do. Is there any way to re-ignite my interest in this game?