Tracking Engagement & Contact Hygiene for Tech Touch customers?

Scenario - If you are having a dedicated team of CSMs (Pooled CS team) responsible for handling the long tail customers or small to medium business, that comprises of 100-400 customers and the CSM to account ratio is 1:50 (approx),

What’s your strategy to;

• track engagement of such customers?
• maintain contacts hygiene?

Let’s brainstorm and share ideas in the comment section below👇🏻