Zksync is coming sooner or later, days ago they have released their ZKsync ERA which is their Mainnet, if you want to qualify for this airdrop, you will have to do some transactions on the Mainnet too, I know some have done a lot of transactions on the testnet and the zksync 1.0 lite version, remember that this is the Mainnet, Bridge your wallet to the Miannet and start doing some transactions before its too late, ZKsync will be bigger than Arbitrum airdrop.
I received an Arbitrum airdrop(around 8000+) as well. Then I moved to the zksync ERA mainnet tasks. This time there will be more users. Also, the airdrop eligibility criteria will be different from the previous ones. Also, Zksync ERA announced a token at the end of this year(Q4 2023).
But I believed they will take the snapshot in Q2 2023 and release a $ZKC token . What you can do is build the number of transactions and the volumes. Also, mint an NFT in the nft marketplace and buy a few nfts as well. In addition to that, please interact with DAO proposals as well.