There is only one strategy in poker. Try to increase your stack at the beginning of the tournament, and if you got it you need to be agressive against other players, trying to raise them time after time , and fold just a little bit. Also you need to steal their blinds, ofcourse when they are grow. No point in raises, for example, when the blinds are 50/100. Try to find some tight players at the table, usually it is at least 1 tight player. Raise his blinds, he will fold, if he raises you or call your raise - you need to be really care, so he can have something.
That,s how i see poker. Be agressive, win more