The zkSync discord is here:

Once you're in, connect your wallet, discord, and twitter accounts to the crew3 dashboard of zkSync here:

This is an official campaign dashboard that gives you various tasks to complete in order to level up and receive roles in the zkSync discord. Usually these discord roles are considered when project decide how much airdrop to give to each user, so make sure to use the same wallet that you used to complete the tasks in the previous steps.