How to be a great CSM when the usual/popular metrics don't apply

I started working for a FAANG-ish tech company where I'll manage only 3-4 accounts but these are some of the biggest companies in the world. Our customers cannot churn because we are somehow a monopoly and known worldwide so our brand is even a benefit to the clients.

Hence, regular CSM metrics/issues like churn, renewal rate, health scores, nrr do not apply to me.

This is different from what i'm used to and in interviews, going on & on about how I improved those metrics seemed to make interviewers excited. Now i'm in this role and i'm just wondering how to drive value or increase revenue when my customers will probably never churn in the next 12 years (yes, our contracts are that long).