Hi, my friend,
From your question, I can understand that you created a homepage template with GemPages, and now you want to revert it to the original homepage template of your theme. So, to resolve this, you could try the steps that explain in this article here: https://help.gempages.net/articles/how-to-replace-my-current-home-page-with-gempages. Please let us know if this helps, and if you need any further assistance, don't hesitate to let us know through our support email: firstname.lastname@example.org. We will try our best to help.