Pro tip: got told at a Phoenix mixer that 80% of my referrals should come from just 5 people, and I only have 2 | Arizona Business Networking - Talk Freely
Honestly that 80% from 5 people thing sounds like something a guru made up to sell a course. Plenty of folks build a solid book where referrals come from 10 or 15 different people, and it works just fine. Two solid referral sources is nothing to panic about, esp if they actually send you good leads. The number matters way less than whether those people keep sending you business.