You can still make money from airdrops, but I can say that it can be recover your expenses in real life. Its just for fill your time, when you don't know what you must do.
You said that you have done with 70 project since last 2 years ago, that is very low quantity if you hoping can make money with this. If you want to be full timw airdrop hunter, make sure you have real business that can pay your bill, and you must have big channel airdrop to get refferals.