Digital CS: What is your ratio of employee: customers? What do you have in place to support this?

I am interested in the ratio of CS members to customers your company currently has.

What automation or processes do you have to support this?

I am looking at assigning 150 customers per CS member, but have little automation supporting them. We may need to have this bump up to 200/per person in the next few months. Right now, the way our team communicates is by inserting a template via our CSP tool to reach out. Essentially a customer falls into one of the following alerts and we reach out.

Alerts:

1. Support users or admin not defined
2. Support tickets not being entered
3. No PS hours used (if bought internally)
4. No training taken
5. Reach out every 30 days asking if there is anything that the customer needs help with
6. (if telemetry exists) comms based on increase/decrease of usage

My process is still being figured out, but it's mainly reactive. Thoughts?