Wingspan's secret is that all three habitats are not created equal. The grassland (eggs) is the engine that funds everything else; the wetland (cards) is the fuel pipe; the forest (food) is necessary but easy to over-invest in.
In a four-round game, your first round should aim to play 3–4 birds with strong "when activated" abilities, ideally in the wetland row. These compound across the whole game — a card-drawer played in round one fires up to four times by game end, but the same card played in round three only fires twice.
Eggs are points. At one point each, with most birds capping at 3–6 eggs, a grassland-heavy engine can quietly snowball into 20+ points just from laying. Pair this with end-of-round bonus cards that reward eggs and you've got a complete strategy that ignores combo decks entirely.
Be wary of expensive birds with juicy abilities. A 6-food-cost bird that triggers a single time is rarely worth it unless its activation effect chains with cards already in play. Read the timing on every card: "when played" is one shot; "when activated" is the gift that keeps giving.