In tournaments it will start with many chips and the blinds will generally be small in comparison. In those early stages you should not reach all your chips in marginal situations, especially when you have a decent hand, but not strong. While in that mode, try to see cheap flops and hope to catch something. Do not take unnecessary risks unless you really have a good hand. Even K K can be doubtful to go all in.
The conclusion is: at first use your survival skills. Then, as the blinds rise and the number of bets in front of you decreases, speed up the pace of your game. That is when you have to attack more often and get aggressive domination of your table.
As the tournament progresses, the stacks of chips become increasingly valuable.
The great poker players will enter the tournaments late to avoid falling into a trap that leaves them out of the tournament, being more "safe" to enter when the blinds rise.