It was great. Monitor the market. When you have a lots of altcoins in your wallet and all have their market value. You should close monitor their price. If your altcoins start rising, you probably don't sell yet. Wait it until it start to drop. So if you notice that the price start dropping, you should sell them.
But in my case, I'd love to hold my token which is IOSToken, my token rises 17%. So, I'm still holding it. Believing that my token will be more valuable.