Wait for it to be listed in an exchange so that you can sell them. There are times when a team would decide to buy back the token in due time maybe after a year or six months then you can just wait for that time since they would buy it maybe for ICO price or higher. You cannot sell it if it is not listed that's why there are tons of messages in telegram always asking when exchange. You can choose to  sell it immediately upon listing or wait for sometime when it becomes valuable.