I was fortunate to double up on the 2nd hand of a DoN

In the previous game, the big stack used his position to bully the rest of the table. I tried this with some success through the 4th level (200/100)
I then switched gears and tightened down. At that point, two of us had approx 3500 chip stacks.

I'm not really sure what the best approach is in these circumstances. My usual game sees me as one of the mid-stacks, riding out the push/fold stage.

What is the best game plan for a big stack in a DoN?