Hi Lucas,
Our goal is to make sure that there are available resources in all zones. This type of issue is rare. When a situation like this occurs, or is about to occur, our team is notified immediately and the issue is investigated.
The error message you are getting is because there is a resource availability issue in that particular 'southamerica-east1-c' zone. As a workaround that may be suitable for you: you can try to create a Snapshot of your VM instance using this link [1] or you can follow the steps below:
1. Go to the Create a Snapshot page in the Google Cloud Console.
2. Enter a snapshot Name.
3. Optionally, enter a Description of the snapshot.
4. Select the Source disk from the drop-down menu.
5. Determine your snapshot storage location. You can use the default storage location, or a custom storage location.
6. Click Create to create the snapshot.
Create an instance from a snapshot and make sure that assign a different region e.g (southamerica-east1-a) by following this documentation [2]