Heyo. My thoughts:
1) Mining/Staking/Masternodes
2) Airdrops/Bounties
3) Shorting w/ leverage
4) Arbitrage
5)...
6) MacDonalds
Anything else?
Airdrop is not suitable anymore to be used as a place to get money / coins. Just bounty campaigns and signature campaigns that are paid with btc that will give you money or an income. If you are a design maker, you can promote what you can. Many new projects are looking for these skills. In this way you can get money or an income.