not only... but also
This structure is used to indicate that one thing is true and emphasizes the addition of another thing, enhancing the contrast.
Examples
彼は優秀なだけではなく、優しいばかりか、助けてくれる人も多い。
He is not only excellent, but also there are many kind people who help him.
この映画は面白いばかりか、感動的でもある。
This movie is not only interesting, but also moving.
彼女は料理が得意なばかりか、掃除も上手だ。
Not only is she good at cooking, but she also excels at cleaning.
Quick check
彼女は料理が得意な___、掃除も上手だ。