I have joined so many bounty campaigns but found nothing. Only those give me some bounty which i cannot exchange. can somebody please suggest me any valid airdrop or bounty campaign which you think really worth our efforts. 
It's hard to find quality projects and get high value with airdrop. even a bounty is in the same situation. The value of ICO depends entirely on the market. and market conditions are facing many difficulties. patience and effort. We need to try to see the real change. Try it.
https://airdrops.io/
https://bounties.biz/