You can only migrate back to bsky.social/Bluesky if your account was originally created there. You need your password from your Bluesky account. If you do not remember it you can reset your password here. Your handle will be the same as it was before your migration.
To migrate to bsky.social, you must review and accept:
There are some risks that come with doing an account migration. The creator or host of this migration tool is not liable and will not be able to help you in the event something goes wrong. You can read more details here.
