Momofdlm

Hello, I am new here so please bear with me. I have booked a Mediterranean Royal Caribbean cruise for August, 2019 through Costco. I was just on the website Raise that sell gift cards/vouchers. I purchased a $250 Royal Caribbean voucher and upon receiving it I realized it can only be used when making a reservation through Royal Caribbean. Now the voucher is useless to me. It is a lot of money. I am very upset. Do any of you know what I can do with it now? I have checked gift card/voucher resell sites and they do not accept these vouchers. It seems that it is only good for a new booking through Royal Caribbean directly