A few habits that separate a careful partnership from a scrambling one. Not a full playbook. Just the shortest list worth internalizing.
Spend the wild heart on straight flushes.
Dropping a wild heart into a straight flush turns a merely strong hand into a near-unbeatable bomb. Save it for that payoff whenever the round can tolerate the wait.
Track bombs before you burn them.
Count how many four-of-a-kinds and straight flushes your team has drawn together. A bomb used to grab an unimportant lead is a bomb missing when you need the Ace round.
Lead small when the rank card is low.
Early in a game the rank card is a 2 or 3, not high enough to dominate. Lead your smallest singles and pairs to unload trash, keeping combinations intact for later.
Remember aces can act as 1.
A-2-3-4-5 is the smallest straight in the game. Keep that option open when you're hoarding low cards, as it's often the difference between a blocked hand and a finished one.
Teammate first, table second.
If passing lets your partner lead cleanly, pass. Guandan rewards the team that finishes together, not the player who wins the loudest trick.