If the other players see you as tight, you should occasionally throw in a raise with what you might otherwise consider a marginal hand. Sometimes you'll get lucky on the flop. Sometimes you'll get reraised and will fold. Sometimes you'll fold on fourth or fifth street.
If you fold after a reraise or on fourth or fifth street, you start to look weak. If you get lucky and win with marginal cards, you get to show the junk you played, making you look loose.
Once you've given some weak tells
, you can go back to your old self for a while.
Don't necessarily think of this as a loss. Think about it as investment in your table image.
When you get that big hand, you'll be ready.