I've joined the airdrop over the past 3 months and I only get very little value from the airdrop, the majority of which I have to keep it to add value.
So how can I earn a few hundred dollars a month if the bounty is a good plan?

just keep you do even you thing you still got a bit of value, just believe one day you will get gain of airdrop, we dont know about the day is come.
yea if you have social media, you can do for join the campaign social media and there you will get more money without of risk.