Have some airdrop programs ever given you big profits? no, I mean how do you spend time just to collect or search for coins from airdrops, if that's good for you, there are some recommended links to search for airdrop programs and this is one of them
https://coinmarketcap.com/airdrop/
by the way not all airdrops will profitable and especially for new projects, from my experience there isn't much to expect from airdrop profits, only coins, even mostly scams. so it would be better if you add knowledge references that can generate profits other than airdrops.