To be a good poker player you have to be unpredictable and able to "change gears". How you do this though should be left to other factors like your table image and your opponents. For instance, if youve been sitting at a table for a while playing like a rock for ages and you havent been caught bluffing yet, then you have ample bluffing equity.
General rule it to play loose when your opponents are playing tight, and vice versa.

If you have been constantly bluffing and stealing more than your share of pots, and a couple opponents wise up to that fact, then its time to change gears. The players who notice that you are playing LAGG and start to playback at you, they are the people you need to be aware of. You need to be more careful against them and attack them with good solid holdings (whilst at the same time, still blissfully running over the rest of the people at the table)