Travel bird has filed for bankruptcy
If you bought a package trip via Travelbird, you might get compensation from the SGR travel guarantee. The guarantee only cover package trips, and not regular tickets, vouchers, gift cards and so on.
Did you only buy regular flight tickets from Travelbird, and not a package trip?
If you paid for your tickets with a kredit- or debit card, you should contact your bank and see if you could get a chargeback.