Can anyone diagnose my problem?

[shama83]

OK, I'm looking for an easy answer to cure my recent poker woes. I usually play 1-2 table, no-limit tournies at pokerstars ($5,$10, $20 fees). According to my primitive stats, I place in the money about 1/3 of the time, which I assume means I'm average. Recently, though, I keep just missing the money.

Being as objective as I can, I think that I play tighter than almost everyone, especially at the beginning. This enables me to survive while 1/3 of the opponents disappear. My plan has been to loosen my starting hand requirements once the table is reduced to about 6 players. But I am finding myself blinded down a lot. Inevitably, I'm forced to go allin, usually against a hand that is a little worse or the same as mine.

The only thing that I am aware of that I might be doing wrong is not going all-in frequently enough pre-flop, in order to steal the blinds.

Does anyone have any advice to offer before I toss my computer through the window?