damnedest
on one's mettle
darnedest
level best
do one's best
do one's damnedest
do one's darnedest
front up
do one's utmost
give it one's best shot
best
effort
go to the trouble
go to extraordinary lengths
hit a home run
go for it
try as one may
striver
all out
go to the wall
strain every nerve
attempter
balls to the wall
try
strivingly
show willing
full out
give one's all
focused
dead set
dig deep
top note
push
ettle
throw spaghetti at the wall
bid
bear down
go for broke
cream
goal
put the pedal to the metal
helper
trick
have a stab
swack
move mountains
diligence
endeavorer
bat a thousand
accomplisher