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いけばいい

can ...; should ...

→ 行く
phrase Rare #35,181
can ...; should ... Often suggests that doing something is an acceptable or sensible choice. The exact nuance depends on context.
JA: 疲れたら、少し休んでいけばいいよ。
EN: If you're tired, you can take a short break.

お前が死んだら、どうやって生きていけばいいんだ

If you die, how am I supposed to go on living?

— HERO (2002)

着ていけばいい

You can just wear it.

— 万引き家族 (2018)

旦那様は行きたい所へいけばいいのに

You should just go wherever you want, darling.

— 紅夢 (1991)

しばらく泊まっていけばいいのに。

You should stay for a while.