Should I post the same content on every channel?

No, Instagram carries the short piece, Google the listing and the hours, and WhatsApp the reply. The same source frame can be reused, with different words and at a different time. Give each channel a job before you export the piece three times. The whole reel is crossed to Facebook and to the listing, and someone who wanted the address reads a trend caption. Each shoot leaves the shared frame and a different text for the feed, the listing, and the message.