That's actually one of the lessons that I have learned in crypto trading especially when I have sold my holdings at a lower price due to panicking. Sometimes, we really have to trust the potential and capability of our coins and we should also learn how to handle our emotions. There are actually instances where unexpected coin could boom in time so patience is really important.
that is why you have to make a target when to sell your coins, believe that no matter how strong you will hold it, it might be a little tempting to always look at market conditions, especially when the market goes up / down quickly the target that you had to hold back could be sold because you were tempted / panicked.
Well one thing is for sure, if you have a play and just execute that, it doesn't matter what the market does because you will be ready for anything. For example, I have a plan that involves price when I sell changes based on where the money goes to, I am not planning on selling any time soon but with each 30% drop I end up selling a bit, and I will sell it all when it reaches 20k and will be in profit.
I also had a plan to buy as well, when I buy I ended up buying when it was lower last year and I got very lucky as well, didn't expect to make as much as 10x and that was really awesome. I do keep buying constantly but I really bought the most during 6.5k or so, I think everyone should have that type of strategy, if you have a strategy and know when you will buy and when you will sell, you will not be in trouble at all and you can make a decent return.