I think in this 2022 bounty hunting is best idea for earning money without investment. Because as we know that now almost IDO are being failed. And ICO, private sales are now very risky they also are being totally failed. You can go with staking, NFT or bounty.
I will prefer you bounty, you can check bounty page there are now a lot of great bounties these are of large pools and many of them are escrowed by bounty manger, so there is less risk of scam.