We will have to add an update hook as there are changes in the configuration ...

We will have to add an update hook as there are changes in the configuration schema, taking a hint from https://www.drupal.org/docs/drupal-apis/update-api/updating-configuratio....

Also, there are instances of using services directly without using DI. Those should also be replaced.

We will also have to mention it in the documentation as it is a major change.