It's hard as some projects are very profitable and some are not, also I am not much of a seller as I am very picky with the projects I get involved with.
If you are you are looking for a new interesting bounty, Unitalent seems like a great one, they are a Swiss based blockchain high skilled freelancing platform (think of Fiver with people who are highly skilled professionals. Link is below and I hope this helps!
There is no certainty for success even how hype the project is.
It depends on the supporters and if the team will deliver, it's normal, when you join a bounty you are like an investor who hope
what you are earning that you hold will someday grow.