As a Bounty hunter I once made a mistake by selling tokens from Bounty that I received in a small market for $ 250. After 20 days the price of tokens that I sell is worth $ 1200. So the conclusion if you want to wait you will get maximum results. Believe every ICO project will prepare a good market in the future.
The thing is, you can never really tell if the price of the token you're holding is going to rise or fall. Holding and selling are both risks and you shouldn't dwell on your regret that much. You have to trust your gut.