Dear Mary,
Thank you for your feedback.
Sure, you may proceed to upgrade Fedora to version 38 and in order to do that safely, please follow the steps below:
1. Launch your Fedora Virtual machine.
2. Click on "Actions" menu on top of the mac menu bar > Select "Take Snapshot" > Press ok
3. Proceed with the upgrade to version 38.
4. After the upgrade > Reinstallation of Parallels Tools shall begin (If not, click on "Actions" menu on top of the mac menu bar > select "Reinstall Parallels Tools")
5. If everything completed successfully > you may delete the snapshot that we created (Click on "Actions" menu on top of the mac menu bar > Select "Manage Snapshots" > Select the snapshot that we created > press on "Delete button".
6. In case of any issues > while the Virtual machine is running > please collect an additional technical report (click Parallels icon on top of the mac menu bar > Help > Send technical data > check "Attach screenshots..." > press Send Report) and send the report's 9-digit ID in a reply to this message.
Thank you!