Participate in bounty campaigns and get rewarded with tokens which can be cash out in your wallet.Its the simplest and most effective way to earn cash without investing money.
I have been involved for 6 months but my income is too low, not worth the effort and time we spend, so I think investing only is the best and fastest way for us to earn. Profit, Bounty is only for auxiliary work and not much focus on them, because they are quite long to earn income.