In everything about trading, there is always a limit to reach to sell or to buy more. For me, the moment I get to the price I have waited for and its attained, I sell some portion of the coin to have a little as reserve for the future probably if the price goes up for more profits (losses can come also). Having a target in trading helps alot to avoid excess loss, where both capital and hunting goes without pay. Staying at the safe side, sell when your target is reached. It could be all, it could be some portion, but just make a sale.