@chandramohans27 have a look at this topic and the linked APIs that Colin updated in the first post. There was a lot of discussion around that original endpoint in the topic that you can review. It looks like there are now replacement APIs in the Beta collection that can be used, as on 4/11: POST /api/source/reset/
Here are the links that Colin referenced in the above post for faster access:
To reset all entitlements on a source, use reset-source-entitlements | SailPoint Developer Community .
To reset all accounts on a source, use delete-accounts-async | SailPoint Developer Community