〜に限らず
not only, not limited to
Noun + に限らず … も
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に限らず means "not limited to", widening the scope: この店は若者に限らず、お年寄りにも人気がある, "this shop is popular not only with young people but with older people too".
The second half usually has も, adding the wider group, or a word like 誰でも, 何でも, どこでも: スポーツに限らず、何でも練習が大切だ, "not just in sport, but in anything, practice is key".
It's a more formal equivalent of だけでなく, and very common in announcements and writing.
It's the opposite of に限って and に限り, which narrow the scope to one case. Before a noun, it becomes に限らない or に限らず, as in 若者に限らない問題, "a problem not limited to young people".
Examples
この店は若者に限らず、お年寄りにも人気がある。
This shop is popular not only with young people but with older people too.
日本に限らず、多くの国で少子化が進んでいる。
Not only in Japan, but in many countries, the birth rate is falling.
週末に限らず、平日も込んでいる。
It's crowded not only at weekends but on weekdays too.
このルールは学生に限らず、先生にも適用される。
This rule applies not only to students but to teachers as well.
スポーツに限らず、何でも練習が大切だ。
Not just in sport, but in anything, practice is what matters.