Customer Engagement & Business Review

I have recently joined a start-up as a CSM and have around 30 accounts assigned to me. From a business ops POV, CS has been reactive and somewhere couldn't articulate the value or the business growth our customers want to achieve. Now, I got the opportunity to reach out to my customers proactively and I dropped emails to my customers to schedule a 1:1 to review their business and discuss the next steps. 

Here's exactly my hiccups:

• It's almost a week since I dropped the intro/business review emails but the response I received is around 2%. I want to personalise the follow-ups and I have a few thoughts which I want to run by you before I execute them.
• Out of the response I received, I would want to review their business and this will be my first ever BR call, I need your input to make the call valuable, and insightful and ensure customer approaches me as their trusted advisor.

Any guidance will be extremely helpful.