being too predictable

I seem to do better playing $20 no-limit than 1/2 or 2/4 limit. I can play for hours with little fluctuation if I wait and play only very good opening hands...problem: I am too predictable! Everyone folds when I play! It seems that the ones who take some risk do better. How do I play strong hands without being so predictable. i was thinking that when I first sit down I should play some rediculous hand