The decision happens on the map, not on your website
Two people on Rundle Street at 7pm search "Thai near me". They see a map, three venues, a photo each, a star rating and whether you're open. They tap one, scroll four photos, read the top review, and start walking. Your website never entered it.
Which means the things you may think of as admin — whether your hours are right, whether the photos are yours or a customer's blurry one, whether the most recent review is from March — are not admin. They are the storefront, and for most venues they are more looked at than the actual window.
Wrong public holiday hours are the quiet killer. Someone walks to a closed door, and Google notices when people ask "is this place actually open" and stop going.