Last 2 days I bought for about some cheap coins and it went down for about 5% or something and I decided to sell. And now, I am at full regret that all of those coins are now up for about 20%. My lesson for that is to be patient since the market was down for some day and it will always go back up.
Well not always, if it went even more down, you would be grateful to yourself that you have sold them and thought you have done a great job, that you didn't keep them! Imagine bitcoin for example, people were buying at 15000$ and they were positive it will hit 30000$, then the bitcoin went to 6000$ and stays under 10000$, their only wish right now, to sell at 15000$ and return their own hard earned money, without any profit! Trade on markets is very hard work and a beautiful peace of art and story with ups and downs
but if that person could have a faith that bitcoin will increase higher again, then he doesn't need to feel regret because of the price is down too deep. he need to wait more and more and never think that he cannot sell at the highest price because I am sure that the higher price will come soon. doing trading is really difficult and need good effort to still waiting for the price but once we succeeded waiting the price is up again, then we can easy to sell our coin again.