〜にとどまらず
not limited to, going beyond
Noun + にとどまらず
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にとどまらず says that something doesn't stop within a certain range but spreads beyond it: その影響は国内にとどまらず、海外にまで広がった, "the impact wasn't limited to Japan, it spread overseas too".
とどまる means "to stay, remain within". The noun is a limited area, like a country, a town, a field or an age group, and the second half shows a wider range, often with まで, にも or 全体.
It's close to に限らず (N2), "not only", and だけでなく. にとどまらず stresses spreading or expanding, so it's typical in news and analysis of influence, damage and popularity.
Don't confuse it with にかかわらず (N2), "regardless of".
Examples
その影響は国内にとどまらず、海外にまで広がった。
The impact wasn't limited to Japan. It spread overseas too.
彼の活動は音楽にとどまらず、映画や小説にも及ぶ。
His work goes beyond music, extending to films and novels.
被害は一つの町にとどまらず、県全体に広がった。
The damage wasn't confined to one town. It spread across the whole prefecture.
この問題は個人にとどまらず、社会全体の問題だ。
This isn't just a personal problem. It's a problem for society as a whole.
彼女の人気は若者にとどまらず、幅広い世代に及んでいる。
Her popularity goes beyond young people, reaching all generations.