Many people wants to have a multiple profits, and they were strongly holding their coins for a long term, but if your coin now has a good market price value there is no reason to hold it, and if you are contented on the price today just sell it, but if you are not contented on the market price today, then continue holding until such time that the price of that certain coin grow up and fit to your needs.
I agree to this. Why are you making this decision based on the suggestions of other members ?
Different members here have different targets and approaches while investing. Some are here for short term trading and thus investing for a margin of 5-10% only. While others want a bigger cut and they can wait longer. Thus, it really depends on what is your target. Also, you need to take into consideration , your risk taking ability. If you do not like taking much risks, sell units sufficient to recover the investment cost and trade with remaining coins.