Firstly check the trash right and then ensure you are JIRA admin to also do restore, they are gone after 60 days, if they are gone then you can also do it by restoring back up, please check your backups and do the restore.
You must have the Administer Jira global permission to restore projects from trash.
To restore a project:
@Niranjan In cloud we have backs ups too . The reason i did not specifically mention Trash is because the projects along with its issues, components, attachments, and versions will be available in trash for 60 days after which, so it is possible that the project is no longer in trash right ?
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