Well my worst decision in bitcoin industry,, it was 3 years ago, i bought some bitcoins for me loading business and in that time bitcoin price is just a hundred dollars, and now the price of it is almost 3000$ and that is my worst decision ever made while im here in bitcoin industry,, better to buy bitcoins now.
That is a very common mistake or worst decision because i also did that thing because i don't have enough knowledge about bitcoin so i enjoy short trading or day trading because i think that it is more profitable than long term because of the ups and downs but after i at least calculated it then i saw that, if i just hold it until now then i'm probably a millionaire now.