You could sell right away or once price drops more than your threshold and buyback later as it stabilizes (if you think it's a good project). At the end of the day, the main thing is whether or not a certain token has intrinsic value which may spark buying pressure sooner or later. Speaking of great projects, Menlo One is getting so much buzz lately and I am not surprised, being a decentralized ICO marketplace with a great team behind the scenes. Here's an interview of Menlo One's CEO discussing about the project https://www.youtube.com/watch?v=Rw1QBpBYE6o