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を成功させるために

in order to make something successful

→ を
phrase Rare #37,214
in order to make something successful Used after a noun to express the purpose of making it successful. ために means “in order to,” and 成功させる means “make successful” or “ensure success.”
JA: 試合を成功させるために、チーム全員で練習した。
EN: In order to make the match successful, the whole team practiced together.

私達はプロジェクトを成功させるために彼を支援すべきだ。

We should support him to ensure the project's success.

学園祭を成功させるために彼らは互いに助け合った。

They helped each other to make the school festival a success.

その計画を成功させるためには君の援助がどうしても必要だ。

We absolutely need your help to make that plan a success.

我々の計画を成功させるためにあなたの助けが絶対必要だ。

We absolutely need your help to make our plan succeed.