I will give you some general suggestion while filtering the airdrops see the previous history of project owners either they have done some project or they are new into the market. Secondly do see the road map of the project and calculate what they are going to solve and change in crypto world.
Road map is a good factor to look at for what airdrops you're going to join and dedicate your time. It's not actually an airdrop at first this time, many of these projects won't have their tokens yet and that's how you're going to join them through supporting them through their apps or whatever they have into their platform to support with. But I tell you guys, not all road maps that are well proposed are going to be followed, no matter how good the project is.