Hi Vineet -
if you want to route to a user task after the retry strategy fails, you could use the pattern as per this thread.
Its quite a sophisticated pattern, so use with caution. The way it works is you keep track of the number of retries and when you get to the last retry, rather than let the job executor catch the exception which would result in an incident, you throw a BPMN error which could then route to a user task for remediation for example…
regards
Rob