Dear Alexa,
I'm afraid that there is no option moving the group form back to the personal form location. Some users has submitted the similar feedback on our product feedback platform and the product developers has kept the feedback status as Open. I suggest you vote and add your comments there as well and I hope that there will be an option available in Microsoft Forms soon.
Allow to move forms · Community (microsoft.com)
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You may use a personal account or a Microsoft 365 business work or school account to submit the feedback.
The Excel results of the form in the personal form location is saved in OneDrive for Business and the owner is only the form creator by default.
After the form is moved to a group, all members in the group becomes the owner of the form and the Excel results of the form is saved in the group connected site in SharePoint Online.
So you will not find the original Excel result file in OneDrive for Business. I suggest you go to the group related site and the corresponding library to see whether the Excel file is there.
The library URL is like https://contoso.sharepoint.com/sites/sitename/Shared%20Documents. If you haven't gone there to have a check, I suggest you go there to see if you can find the Excel file.
If yes, open the group form and do a test to see whether the responses are synced with the Excel file in SharePoint Online. If yes, the group form should be fine.
If you want to move the group form back to the personal form, you may click on the group form>...>Copy to copy it as a new personal form.
Then add a reply to the new personal form>open the Excel file in SharePoint Online, copy the previous replies to the new Excel file of the new personal form in OneDrive for Business like the following. The id will be recounted but you can format the id manually.
Now when you add the new replies to the new form, the responses will be synced as well.
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Thanks for your understanding.
Sincerely
Cliff | Microsoft Community Moderator