Enter an obelisk's/ beacon's/ transmitter's inventory and press "Travel to another server".
You can travel with your inventory, or upload your items in the "ARK DATA" tab (50 slots available). It's not possible to upload or travel with element, element shards and TCsAR vault. Creatures upload is disabled, you have to transfer your dinos in soultraps. You can upload tributes for bossfights with the "/upload" command in chat after opening the transmitter. Be aware that some tributes despawn on certain maps on server restarts due to a change Wildcard made in 2021.