If you do not want to keep your Global Journey Package in 2021, your package will be converted into a voucher (via the Tomorrowland Account of the Main Buyer). The voucher will have the exact same value as the price you paid for your travel package. This voucher can be used in the 2021 or 2022 Global Journey Travel Shop.
The exact validity period will be indicated on the travel voucher. As always, do mind that - due to high demand - there will most likely be a limited capacity in the variety of lodgings, ticket types and transportation in the Global Journey Travel Shop. Most of the DreamVille special accommodations will probably remain sold out.