If you recieved recently a token, don't sell it for now because you will regret it if the price of that coin rise. Most of the time, if you just received a token, its price in the market is very low at first so you need to look for the time when your coin has greater value plus the price of the Eth or bitcoin is high(even not too high but not too low like today). For me, after you received the token, sell it after 1 month or three months and see if the price of your coin has already greater value then if it is, that's the right time to sell your coin. I think base on my experience, when you hold your token let's say for half a year, the value of it is getting lower and lower each day and that's when I can't sell mine.