The goal of all Poker players nowadays is all about making it to the major tournaments, what with all the money and the fame that goes along with it. However, when in a tournament, you should know that diverse tactics are necessary.
If you had been doing research on Poker tournaments (and you should) then you probably know that you should play as tightly as possible because of the number of wild players that are involved. That is true, but that Poker strategy is only valid up to a certain point.
When you get into the middle stages, a different approach is needed, as your objective now is to stack up your chips for the latter phase. Therefore, your Poker strategy at this point would be to play a little more loosely and much more like your regular game. This does not mean you should be careless, but rather that you should be more willing to take chances.
The reason is that the players who have made it this far in the Poker tournament will be tighter than ever, because they are closer to the money paying stage. Because you came in from the early levels as a tight player, any bluff that you will try to pull off will have a greater chance of succeeding.
The same approach should be made in the final table in a Poker tournament. At this point a lot of players will be extra cautious and tight, but with a sufficient card, you will be able to take on a more aggressive stance and cause others to fold. Again, this does not mean you should go wild, but rather make sure that if you do make a move, it has to be with a strong hand.
Of course, you should also keep an eye on the players with the big stacks, as trying to pull a bluff against them is not a good idea. In this case, you should simply let the big players take each other out, and focus your attention on those that are left, especially those with smaller stacks.
When in a Poker tournament, it is important that you are constantly aware of what Poker strategies are appropriate. They will change at each phase, and you need to make the proper adjustments based on the situation as detailed above.
By keeping these things in mind you will have a much greater chance of advancing and eventually winning it all.