The audience worth building is the referral partners
Realtors, lenders, attorneys and accountants encounter insurance needs constantly, and where they send people depends on who is present.
A realtor closing a sale, a lender writing a mortgage, an attorney forming an entity, an accountant reviewing a business: every one of those regularly reaches a point where the client needs coverage.
Which agency they mention is a function of who they know and who they have seen recently, and that is exactly what this channel is good at maintaining.
The content for that audience is different from consumer content. It is about the situations they encounter, what their clients typically need, and what tends to go wrong.
Professional networks are where these people actually are, which makes them a more useful place for an agency than consumer platforms.
The measure is not followers. It is whether the professionals who send you work are aware of you, which is a small and identifiable list you could write down.