What to do with expiring krisflyer miles?

How much miles do you have left? If it is not near/enough for a tix, consider doing a non flight redemptions

If the amount you have a in the few thousands, go for the newly developed krisflyer events called "Krisflyer experience"

If it is more than that in a tens of thousands, you should be able to redeem a flight with that amount.

In the hundereds of expiring miles, ignore it