https://www.united.com/ual/en/us/fly...eptionPolicies
the change waiver should apply to OP's scenario (have to trigger cancel by august 31st)?
or wait to see if the deadline extends again, no guarantees. typically nonrefundable tickets (but cancellable), conveted to ETC have to be used within 12 months. it's only 24 months now with the current policy/waiver
do note that UA is flying EWR-DEL daily now, so chances of a cancellation/schedule change is low (unless india closes flights again)