Sorry, the only option is to restore the backup you (hopefully) made before condensing your file.
Resolution for 'condensing issue: 'can I uncondense my quickbooks?' available: Yes.
The condensing issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the condensing issue yourself by looking for a resolution described in the article. If it is a complex condensing issue or you are unable to solve the issue, you may contact us by clicking here or by using other condensing support options.
For more information about resolving issues related to condensing in Quickbooks/QBO or to get support for the issue 'can I uncondense my quickbooks?', click the link below: