Have a view other than Lysenkoism prevail in terms of agriculture. This would mean farmers don't do 'close planting' or 'deep plowing' which was outlandish pseudoscience that killed millions in the Great Leap Forward. You could have collectivization, without that insanity, maybe more Soviet advisers, somebody knowledge speaks up and doesn't get purged for it, and/or Mao wakes up on the right side of the bed.
Also, no iron production drives. The Great Leap Backward forced peasants to smelt their housewares and tools, Mao thought this would make steel, but only makes pig-iron, he reversed this when he went to steel plant and figured out how it's actually produced (whoops.)