Why

You've got 4–10 people fielding inquiries across six channels (WhatsApp, Email, Phone, Web form, Referrals, LinkedIn). Even at 10–50 inquiries/month, the problem isn't volume — it's that no single person can see who owns the LinkedIn DM that came in last Tuesday. Worse: you're advising clients on exactly this discipline. If a prospect asks "what do you use?" mid-call, the answer has to be a real one.

What you actually need

1. HubSpot Free CRM (free up to 5 users, paid tiers from ~$20/seat/mo) — central contact record, web form native, Gmail/Outlook sync, LinkedIn extension. One pipeline: Inquiry → Discovery Booked → Proposal → Closed.
2. Zapier or Make (free tier, then ~$20–30/mo) — pipe web form submissions and a shared inbox into HubSpot as deals, auto-assigned round-robin to your 4–10 team. WhatsApp inquiries get logged manually via the mobile app for now.
3. A habit — the Monday 20-minute pipeline stand-up — whole client-facing team walks every deal in Discovery or Proposal stage. Anything untouched 7+ days gets a named owner and a next-action date before the meeting ends.

Do this today

Go to hubspot.com → sign up for Free CRM → invite your team by email → Settings → Objects → Deals → edit pipeline → rename stages to Inquiry / Discovery Booked / Proposal / Closed-Won / Closed-Lost. Then connect your web form via the HubSpot embed code or a Zapier webhook. By tomorrow every new web inquiry lands as a deal owned by a named human instead of dying in a shared inbox.

What to ignore

Skip HubSpot Sales Hub Professional ($100/seat/mo), Salesforce, and monday CRM — at 10–50 inquiries/month they're 5x what you need and you'll spend the first quarter configuring instead of selling. Ignore Apollo, ZoomInfo, Outreach, and Salesloft entirely; those are for outbound SDR teams, not referral-led consultancies. Anyone pitching you "AI sales agents" right now is solving a problem you don't have.

What doing nothing costs you

A conservative 15% slippage on 30 inquiries/month (midpoint of your range) ≈ 4–5 lost opportunities. For a consultancy with even a $10K engagement average, that's ~$500K/year of pipeline leaking through six unmanaged channels — and the reputational cost of preaching process you don't run.

When to revisit this

When WhatsApp inquiries cross 20% of total volume — then add Respond.io or a WhatsApp Business API layer feeding into HubSpot.