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頑張れば

if (you) try hard, if (you) do your best

→ 頑張る
頑張れ do one's best, work hard, persevere + ば Conditional (“if”)
verb · informal Rare #42,698
if (you) try hard, if (you) do your best
JA: 頑張れば、きっとできるよ。
EN: If you try hard, you can definitely do it.
Conjugation of 頑張る
Conditional
頑張れ頑張れば

頑張ればいっぱい貰えるよ

The harder you work, the more you'll get.

— 動くな、死ね、甦れ！ (1990)

勉強さえ頑張れば

As long as you work hard at your studies

— いまを生きる (1989)

もっと頑張ればよかったんだよ。

I should have tried harder.