Write a lambda in some cloud provider framework and run it every 1 hour to 24 hours and if it finds expired certificate, it will use webhooks to send you a message on Slack or Gotify or whatever.

Or you can just periodically renew the certificate on server using Task Scheduler + win-acme or Cron and certbot.

haha, I was asking if somebody build that or recommends good open sourced version of exactly this