I focus on surviving, relaxing, executing my strategy, and getting to each break. Multi-tabling can help but that is a somewhat indirect solution and is probably only good for a temporary solution since multi-tabling is not practical in a live environment (sometimes not even in an online environment).
In addition, multi-tabling will also split ones focus thus reducing overall potential at any given time frame for a single game thus if one's goal is to become as skilled as possible this is not directly suggested; though it can be used to train in other areas but because of the split focus should be avoided in tournaments and matches that one is taking completely seriously where one wants to win with 100% of their spirit and will.
The simple answer is one must become stronger, one must resolve to never lose focus no matter what.