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Here is a suggestion: consider a switch to PoW/PoS.
The PoS aspect will be one more reason to accept/use ziftr.
The interest from PoS would create an incentive to also hold ziftr (while strengthening network) and not just acquire ziftr for spending alone.
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Personally I don't think that PoS would be best suited to this form of currency. While it would drive short term buying of the coin, it would also lead to a lot of large deposits of help coin that aren't being used and spent. It could work, but it would most likely be at an extremely small yearly percentage.
Why would PoS not be suited?
The large deposits of coins that are not being spent happens no matter what.
Bitcoin is not PoS but has that happening.
PoS will only lead to increase in holding by a small amount but still provides users some incentive to own ziftr and not just purchase when spending.
The difference is people will be always invested and part of ziftr if they are actively holding it.
If they are only buying ziftr for the discount then they have no reason to be active and supportive of the community or coin itself.