Other hyponyms of improve include
alleviate,
assuage,
relieve,
aid,
help,
regenerate,
revitalize,
enrich,
build up,
develop,
turn around,
help,
upgrade,
condition,
emend,
iron out,
put right,
straighten out,
enhance,
bushel,
doctor,
fix,
furbish up,
mend,
repair,
restore,
touch on,
reform,
reform,
beautify,
embellish,
fancify,
prettify,
build,
hone,
perfect,
down,
fine-tune,
polish,
refine,
distil,
distill,
make pure,
purify,
sublimate,
fructify,
lift,
raise,
advance,
upgrade,
educate.