Originally Posted by
AsiaTraveler
Yes, purchasing new fares and then cancelling them will achieve your goal.
However, be careful to note which of your credits will expire and which will not. If past precedent applies, you could wind up turning non-expiring credits into expiring one. They did away with credits expiring but only for flights purchased after July 28, 2022.
Any new reservation even with old funds will be updated within an hour to non expiring. The exception is if you use a LUV voucher. If so, you should cancel and use the funds to rebook the same trip, which will then be non expiring