Aside from trading/investing or mining, we could actually earn through bounties. Joining signature campaigns is one of the easiest way to earn cryto. But the earnings usually based on the rank and how long you are in the campaign itself. But this not guarantee your earning as some ICOs are better than the others. Also, social media campaigns are also popular but with less earning. Translations, which is becoming a thing now, is also good. The earnings would be different. But you can certainly earn 1000$ or more in a single campaign.