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ならなくて

not become, not turn into

→ 成る
verb · informal Rare #42,381
not become, not turn into Often used with いい or はいけない to express whether becoming something is necessary or required.
JA: 今すぐ医者にならなくていいよ。
EN: You don't have to become a doctor right away.
Conjugation of 成る
Quotative
なるそう
Potential past
なられました

そんなに神経質にならなくていいよ。

You don't have to be so uptight about it.

私たちは、もっとおしゃべり好きにならなくてはいけないよ。

We need to become more talkative.

わざわざおいでにならなくて結構です。

There's no need for you to go out of your way to come.

大して利益にならなくて

It wasn't very profitable, and...

— PERFECT BLUE (1998)