I once read the story of a guy that gained $10,000 from Bitcoin in 2017, he sold on September and thats probably before the huge increase. Due to his friends holding till then they made millions, which is huge compared to the chicken change he got. So his emotions played out and he started buying Bitcoin despite the decrease in price in 2018 and thats how he kept losing. So avoid trading with your emotion.
That is a terrible story, and I am not talking just about the fact that he sold his coins before we saw the huge increase at the end of the year, that is bad in itself, the truly sad part is that after he made that mistake he didn't have any strategy to come back to the market and buy bitcoin again and capture most of those gains.
And then after those two mistakes he made an additional mistake by buying bitcoin during 2018 when the only thing that bitcoin did during that year was to go down losing any profits that he had, I have no problems admitting that I held my bitcoin during all of that time frame and I also earned and lost money because of it but at least I did not took an emotional response and instead began to study the markets.