A workflow replies instantly when the store is closed and says when a person will answer, on all three channels.
Each channel to the right person.
Instagram to whoever runs social media, WhatsApp to the sales team, the Facebook page to support. Assignment runs on its own when the conversation opens, with or without business hours.
And when needed, AI.
Rules cover what is predictable; for everything else, an AI agent that answers with your information and hands off to a person when it should.