I think the airdrop should be something similar to Optimism and coins allocating for different participations and eliminating the highest amount of airdrop hunters:
Small percentage for those who used the testnet and did multiple trades and used bridge (smallest percentage 5%)
Percentage of the airdrop who have made more than 5 trades total on zksync and those trades didnt just occur on a single day (20%)
Percentage of airdrop for those that used the bridge (15%)
Percentage for those that created a trading pair and added liquidity to the exchange (35%)
Percentage for those that donated to the ZIGZAG exchange using the Gitcoin link that appeared on the exchange a few months ago (25%)