Pandemic is lost in two ways: outbreaks chain out of control, or the deck runs out before you cure four diseases. Both failures share a root cause — the team treated symptoms instead of curing root problems.
Assign clear roles in the first two minutes. The Medic handles outbreaks, the Researcher carries cards between players, the Scientist needs only four matching cards for a cure. Everyone else funnels cards toward whoever is closest to a cure. If you're not in this loop, you're moving cubes — important, but not winning the game.
Talk through every player's full turn before they take it. "I'll fly to Atlanta, give you blue, then you build a research station" is faster and safer than three players individually optimising. Most groups lose because they each played good turns that didn't add up.
Build research stations early and aggressively. Each one massively increases the team's mobility and lets you cure diseases from anywhere in that colour cluster. Three stations placed in the right cities can shorten a cure delivery by four full turns.