Aggressive = "Hang out in the ready room, get to know your pilots, be willing to go to the briefs or at least ask the pilot when he wants you there, and show interest and you'll get flights."
This advice is spot on....and actually easy to do. Suit up, show up and show interest in the aircrew and your tour as a FS is much better.
Also, take care of your ground guys too. Those folks will take care of you as well!