My strategy is fluid, in that I want to adapt my play to the situation in front of me. Generally speaking, I want to make the best decisions possible. Of course it will never happen 100% of the time, and sometimes my reads are wrong. It sounds really cliche, but I try to take it one hand at a time. Of course, during the course of the tournament, I am noting players that I have played against, especially big hands that occur (regardless of the outcome).
I try to forget about things like field size, when the bubble occurs, things that I have no control over. Of course, I will tighten/loosen my player as the situation calls for it. Around the bubble, I will try and pick my spots, but not get too reckless, especially against stacks that can bust me.
In short, just trying to keep in the moment and not let the situation become too big.