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.
There is really no exact time or date when will be the value of the coins increases or decreases. There is no other way but just to observe the trend of its value and wait. Patience is virtue.