Most tokens that were distributed from bounty campaigns doesn't have a value at first so you need to wait for it to get listed on exchanges. You need to check the project's telegram group for updates since most developers post their updates there about what exchanges they are using. Another option is P2P, where you can sell your token/coins to another person who needs it but it'll be hard to find someone and you can get scammed from this kind of transaction so better trade it on exchanges for a safer deal.