I'm afraid there is much truth in the old adage "Travel broadens the mind".
The average American famously provides an example as to why travelling exclusively within the borders of your own country, no matter how expansive it may be and how awesome you feel it will be, will always be no substitute for true cross-border travel.
You can't appreciate other cultures, other cuisines, other ways of thinking simply by reading books or watching YouTube videos about far-off places. The only way you'll ever broaden your mind to truly understand why your fellow humans elsewhere on this planet behave in a manner you perceive so differently to your own is to go there and smell it, hear it and feel it for yourself.
I fully appreciate that frequent and varied cross-border travel is somwhat a luxury, but equally its a case of some is better than none.