I have a voucher for C1-C2 round-trip in F expiring on Dec 28, 2016. What are my best options to avoid it just expiring if I cannot find anything useful (on 77W) - that is apart from "selling it" against the T&Cs?

Should I just book any F round-trip as far out as possible, and hope I make change within the next 12 months?

Thank you