I mean, whether you hold it on the trading site or in your wallet, as long as you don't cash it out, it's open and susceptible for the changes that might happen in the market, whether its due for an increase or decrease depends on the market trends that are reigning during the time you have in your possession those coins. The only thing that would save it from such changes is when you actually would encash it, at least then, you won't have to worry because cash is a more stable currency that cryptocurrency.