Playing on the bubble, you have to focus on the stack.
Suppose you have a small amount. In this case, it is better to play cautiously not to risk it, to wait until out opponents and act directly in the money. Although, if your opponents fold openly, it is necessary to take advantage of this and try to collect the blinds. To reach the end, push on the players. Most people are afraid to lose in front of the prize area and significantly touchout.
If you have an average stack, it is better to try in big hands not to participate, but you can try to put pressure on those who have fewer chips than you.
Short and medium stacks are engaged in survival, and for them it is very important to guarantee a minimum payout. Room for manoeuvre they have, and to risk even a pair of blinds, they will not.
If you have at the table there's a guy regularly looks on the watch is your client. Such people are the whole game watching the number of players and time until next level. They are only interested in the lower bound of the prize, and they are unlikely to actively protect your chips as long as the bubble does not burst.
Do not touch the leaders, if your stack will not be able to cause serious harm to his position, he will easily expose you, even with garbage, and try to beat. The blinds have big stacks quite a dangerous idea.
If the person is hanging on the verge of departure, and does not have even a slim chance to "see out" to the prizes, he's willing to push everything. Do not get involved in the adventure, leave short stacks leaders, and they will send them to the stands.