by firexed
Post your worst games and ask for opinions of top players. You learn more from losses than easy wins.Understand what makes the factions tick (at least the top few like darklings, engineers, cultists etc). Use TM Tools & play through top D1 games.
Don't be afraid to try unusual openings if the game demands it- 6D with engineers/darklings, 3TP+D with nomads etc.
Don't underestimate the possibility of opponent aggression- taking ACT6 or ACT6 + dig to block you, if they have the resources.
Other subtle stuff like when & where to build/offer leech, how much to leech, passing fast/slow etc.