Hi@buteaur,
Based on the issue that you mentioned, do you want to save data to Excel/SharePoint and reset the App?
Could you please share a bit more about your scenario, is the Excel/SharePoint has the same data structure to your app?
I choose to create an App from Excel/SharePoint data which makes the App have the same data structure to the data source.
If you use SubmitForm(), please try the following workaround.

1/ Create an App from data(Excel/SharePoint), you will get 3 screens: BrowseScreen with BrowseGallery1, DetailScreen with DisplayForm1, EditScreen with EditForm1.
2/ Set the OnSuccess property of the EditForm1 as below:
NewForm(EditForm1)
After this, once you submit the form successfully, you will reset the EditForm1 where all the entries will be clear.
Note: If you use Patch() function, you just need to add a reset button and set the same formula to the OnSelect property.
Please check the Gif.

Best Regards,
Qi