SBI Rewardz - best way to redeem points?

I’ve around 20k reward points in SBI Rewardz, I was happily going to redeem 5k Amazon Pay Gift Card and saw that only around 30% of gift voucher can be paid via points, rest 70% needs to be paid separately.

Other redemption options are mobile and DTH recharge … don’t have DTH and mobile recharge is once a year

What’s the best possible way to redeem these points?