The only advice I can give you is to participate only in projects with potential for success. No matter how promising a project may be, if they failed their ICO they can't pay you your due pay when they didn't gather their minimum cap. It is frustrating to join a bounty campaign that won't pay you in the end. Avoid joining scam ICO's too. They also won't pay you your due pay even if they gathered their cap and the only advice I can give you to avoid joining into one is to always research first about the ICO of the bounty campaign you want to join.