This fulfillment of duties is part of the endless PS cycles within sansara. If one sees this as the purpose, then one should remain in sansara forever. These debts are sky high and very painful to pay back. Angulimala never paid back all his debts and left as Arahant.
People have this feeling that there is a purpose or that something happened in life for a reason. Sure, there is enough reason for vipaka. This we experience every day. If some event triggered a big change in life it happened because of attachment or because of PS cycles related to this event. But still all happens in the realms of sansara and is rupa based. Attachment to rupa is the problem, not the solution.
All what is needed, is to stop the mistake of attaching to anything in this world. That requires the development of panna. Nothing more, nothing less.
