Error: An account with this username or email does not exist.

Where do you run WordPress?
If you are using Lightsail and bitnami, you can use the method in the following document.
However, this procedure requires that you be able to log in to the server via SSH or other means.
https://repost.aws/knowledge-center/lightsail-reset-wordpress-password

Another method is to restore a new instance from a previously created snapshot.
However, this method cannot be used without creating a snapshot.
https://lightsail.aws.amazon.com/ls/docs/en_us/articles/lightsail-how-to-create-instance-from-snapshot

What you mean by 'Where do you run WordPress?'. I'm not so much familiar with this website thing