〜ばかりか means "not only... but also" — X is true, and Y (often more significant) is also true.
Addition - Not just X, but Y too
Escalation - Beyond X, even Y
He can speak not only English but also Chinese.
More formal than だけでなく. Often followed by も or さえ.
Noun + ばかりか or Plain form + ばかりか
Often followed by も/さえ/まで
Formal — written/formal speech
Not only rain, but the wind has also gotten stronger.
Not only was I late, but I also forgot my homework.
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