The max you will get in a genuine airdrop is $5. Unfortunately that amount has now reduced a lot because of the current state of crypto market . It is better to concentrate on genuine Bounty projects than airdrops. I personally prefer signature bounty above all kind of bounties.
It is clear that the signature campaign always helps you to get higher profits than other campaigns. I also only participated in the signature campaign and it has helped me to gain a lot of profits in the past. Currently the market is too cold and there are too few signature campaigns running, I hope in the future the market may get a little better. Btw your rankings are too low to make a lot of money from signatures