Why

Twelve referrals a month is a manageable number for one person to track manually. You're already using a Sheet, which means nothing is truly falling through the cracks structurally. The real risk at your volume is a referral sitting in the Sheet for two weeks with no action because no one nudged it. Xero is your system of record once they're a client — you don't need a second database before that point.

What you actually need

1. Google Sheets, free — add three columns you likely don't have: "Last contacted date," "Next action," and "Next action due." That's your pipeline.
2. Calendly, free tier — send one link when a referral responds so they book a discovery call without the email back-and-forth. Saves two to four messages per lead.
3. A habit — Weekly 15-minute Sheet review — every Monday, scan anything where "Next action due" is today or past. Move it or close it. Twelve leads a month means you're reviewing roughly three rows per week.

What to ignore

HubSpot Sales Hub, Pipedrive, and Zoho Bigin are all being pitched to firms like yours. At twelve referrals a month with no sales team, you'd spend more time maintaining the CRM than working the leads. Freshsales and monday CRM add cost and onboarding overhead that make no sense until you have a dedicated person managing business development. None of these tools fix slow follow-up — only a habit does.

When to revisit this

When you cross 40 referrals a month or hire someone specifically to handle new business enquiries — whichever comes first.