Other hyponyms of step-up include
addition,
advance,
rise,
appreciation,
surge,
upsurge,
augmentation,
amplification,
enlargement,
expansion,
escalation,
maximation,
maximisation,
maximization,
exaggeration,
expanding upon,
expansion,
accrual,
accumulation,
inclusion,
aggrandisement,
aggrandizement,
elevation,
strengthening,
intensification,
intensification,
split,
split up,
stock split.