Do not disconnect the static IP address from a Drupal instance while the site is in maintenance mode and try to make it a subdomain of the now running replacement.
Taking a step back today.
stLouIST.com is up and going.
The archive is running, but really angry.
Nothing like a mix of Lightsail, Route 53, Bitnami Apache on a Drupal 8.5.3 instance, Liquidweb Mail/DNS and letsencrypt.
At least I found the right Drush command to take it out of maintenance mode.
For all you other Drupal 8.7.9 misfortunates out there:drush sset system.maintenance_mode 0
In short the archives will be up in a day or three.