First of all sorry about late reply, had been traveling and not always in the areas with accessible internet connection
Regarding the question, unfortunately for you the whole deal behind Super Economy offer is that tickets are 100% non-refundable & non-exchangible, that is the reason why they sometimes being very cheap. Here is the
TrenItalia info about tariff rules (TrenItalia also should have warn you at the moment of purchase about conditions). Our suggestion (in order not to lose money) is try to look on big travel forums for some fellow travelers who might travel around your date, maybe you'll get lucky and can sort of re-sell your ticket to somebody. Obviously it's not a great suggestion, but probably it's the only thing we came up at the moment