Digital Customer Success - Red account strategy

Hello community!!

It's been a long time since my last post. I am interviewing for a Digital - Scale CS role and a question came up that got me thinking:

If managing your pool of customers you find 100 customers who are completely inactive and haven't used your product in the last 3-6 months, no active users, no transactions, nothing...

In a pool, scale strategy, what would you do?

This was my answer, and I'm looking for other thoughts...

1. These customers would fall on a red-bucket type of interaction. First thing I would do is validate if these customers are engaging with us at all? Review all data: support tickets, emails, or any related information.
2. If no communication whatsoever, enroll them in a series of email communications, share with them case studies, valuable information, resources that can help initiate contact again.
3. If no open rates or communication back, involve human interaction trying to contact the customer.

Any thoughts or ideas on a better answer?