Hello @Anmol Ganju Sorry to hear that the Sharepoint's limitation is blocking your ADF capabilities!
Did you check SharePoint's list view threshold, which limits operations on lists with more than 5,000 items.
This issue occurs because SharePoint Online uses the Large List Resource Throttling feature. By default, the list view threshold is configured at 5,000 items. When the defined item limit in a list is exceeded, the message is displayed.
It is not possible to modify throttling for SharePoint Online. Additionally, while it is possible to modify throttling for Sharepoint on-premises, it is not recommended.
If you encounter this error, it is recommended to configure indexed fields and/or adjust your queries to maintain performance, which I think you have already implemented!!!,