頑張れよ。
Words
頑張る
(がんばる)
to persevere; to persist; to keep at it; to hang on; to hold out; to do one's best; to insist that; to stick to (one's opinion); to remain in a place; to stick to one's post; to refuse to budge
よ
(よ)
indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!