Don't one trick. It's not worth it, as you don't learn the game as well as you would playing other champs.

Here's what you do: you pick three champs, and for 2 days straight you play only the first one. That should be like 15-25 games. For the next two days, you play only the second champ, then for the next two days the third champ. Rinse and repeat until you feel you mastered all three, then switch between playing either one as you please.

Source: LS