Out of 70 Airdrops I promote since 2018 only 15 paid me good reward, I've been a full time Airdrop Hunter until someone tell me to come on here, anyway to make more free coins ? Is Airdrop still good ? Tell me ways to make free coins without investing a dime, thanks
You can try to join the game competition. This is one that you can try Cartesi + WazirX — $5,000 CTSI Creepts Gaming Tournament Begins! With this, you can get the chance to win rewards, as well as get entertainment from the game 
Most airdrops don't currently give big profits like in 2017. Most are just manipulations and usually don't meet the minimum requirements for sale. So consider carefully before joining airdrop. The only profitable airdrop is the one held by a trusted olex exchange that was held by UPBIT last year. I also really hope that there will be more like this year:D