Other hyponyms of improve include
alleviate,
assuage,
palliate,
relieve,
aid,
help,
regenerate,
revitalize,
enrich,
build up,
develop,
turn around,
help,
upgrade,
condition,
emend,
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.