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決めるのは

deciding ...

→ 決める
phrase Uncommon #13,961
deciding ... The の nominalizes 決める (to decide), and は marks it as the topic. The phrase is often followed by a statement about who is responsible for deciding or whether deciding is right.
JA: 旅行の日程を決めるのは幹事です。
EN: The organizer is the one who decides the travel schedule.

何をするかを決めるのは君自身だ。

You decide what to do.

行くべきかどうかを決めるのは君次第だ。

It's up to you to decide whether to go.

そのことを決めるのは君の役目だ。

It's your job to decide that.

どれを買うかを私たちが決めるのは困難であった。

It was difficult for us to decide which one to buy.

医者が人の死ぬ時期を決めるのは正しいことでしょうか。

Is it right for doctors to decide when someone should die?

決めるのは君次第だ。

It's up to you to decide.

行くべきかどうか決めるのはあなた次第だ。

It's up to you to decide whether to go.

何を食べ、どんな生活を送るのか、決めるのは自分自身だ。

It's up to you to decide what you eat and what kind of life you lead.

どちらを選ぶのかを決めるのはあなたの役目だ。

It’s your responsibility to decide which one to choose.

決めるのは今でなくて構いませんよ。

You don't have to decide now.