Of course you shouldn't hold the coin in all your life that's why you hold it is to have a profit and don't be too greedy to hold it for a long time since I really can tell that it is not worth it and you probably miss your chance to take profit for that particular coin. But holding is not that bad as long as the price keeps going upwards but still you should make sure to take profit from time to time.
Making profit from time to time means that you have to cycle to money into sell-buy-sell cycles otherwise the total capital on your networth remains constant.
Being stubborn about selling is a wrong approach. You need to be flexible about your approach to making profit. When the market price is dropping, get fiat ready and use it to buy the coin and similarly when it crosses your target price, sell some, you will be looking forward to buy back on the next bear cycle.
If you remain stubborn and dont sell - you miss two opportunities
1. The possibility of selling at a high
2. The possibility of buying at the next low.
This stagnancy in your personal ledger is one of the reasons of anxiety and depression among traders. Try to avoid that from happening.