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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.