broaden someone's horizons
US /ˈbrɔːdən ˈsʌm.wʌnz həˈraɪ.zənz/
UK /ˈbrɔːdən ˈsʌm.wʌnz həˈraɪ.zənz/

1.
to increase the range of things that someone knows, experiences, or is interested in
:
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Traveling to new countries can really broaden your horizons.
•
Reading different genres of books helps to broaden your horizons.