Play it one table at a time. Big tournaments take a lot time and patience to take down, so don't feel like you need to rush and build a big stack. If you get the cards to early on, then do so. Most of the time, you're folding a lot. Play in position in lot, start stealing chips and picking up dead money when you can. Focus on building your stack slowly and steadily until you pick up big hands, then extract as much value as you can from your opponents. As blinds increase and stacks shorten, open your range and play more aggressive. Attack the tight/weaker players. 3 bet more against raises in position. Steal and resteal.
Finally, run good.