A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Jasmine,
Thanks for writing back and updating us with the requested information.
As per the further updates, I would like to convey that you can go to the Pages Library in the SharePoint Online site and make the old page as a homepage, here are the steps to follow:
Step 1: Open the SharePoint Online site> Click on the Pages in the Site Navigation:
Step 2: Right-click on the old home page> Click on Make Homepage
Now if you click on the Home in the Site Navigation of the SharePoint Online site, you will see the old page as a Site Home Page.
However, if you are having only one page in the Page Library of the SharePoint Online site, it seems you have add template to the old page, where you can revert it back via Version History: Right-click on the Page> Version History> However your mouse over the version and click on view to check the version> If the version you are viewing is the required to be home page, you can click on the restore button.
I hope the information provided helps your requirement and if there is anything I missed or confusion, please feel free to post back to us with more details and some screenshots.
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In the future, if you have any further concerns related to Office 365, please feel free to post a new thread in this community and we will try our best to assist you.
Have a good day!!
Best Regards,
Sophia