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We implement a visual hierarchy.
The simplest example of this technique that comes to mind would be to make an element bigger to turn it into a focal point (which is, incidentally, the same reason no one ignores Godzilla). Take Netflix for example. When opening the main page, you will be hit right away with a few highlighted recommendations which draw your attention by being almost impossible to ignore.
Other, more novel ways through which you can implement a visual hierarchy would be by using white space to highlight crucial parts of your interface.
Alternatively, simply introducing an unexpected element into your design in a tasteful fashion can work wonders. Consistency in an interface is crucial, to the point where it can border on repetition. When something breaks that visual pattern, your users will sit back and take notice.