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決めなきゃ

have to decide, must decide

→ 決める
決め decide, determine + なきゃ Necessity (must / have to)
verb · informal Rare #43,756
have to decide, must decide Colloquial shortening of 決めなければ (いけない／ならない).
JA: どちらにするか、今日決めなきゃ。
EN: I have to decide today which one to choose.
Conjugation of 決める
Necessitative
決めなきゃ

やらなきゃいけないことを決めなきゃ。

I need to decide what I have to do.

決めなきゃ何を？

Decide what?

— アバウト・タイム ～愛おしい時間について～ (2013)

自分のことは自分で決めなきゃダメよ

You have to make your own decisions.

— ハウルの動く城 (2004)

明日までに決めなきゃいけないんだ

I have to decide by tomorrow.

— The Wind Rises (2013)