For the first time, when I move to cryptocurrency world (March 2016) the btc price were around $400... it was risen up to $17000 few days ago... 17000/400 x 100 = it's 4520% growth in 21 months.
There's a popular statement such as, the thing what it is existing next to the risk is the success.
Should I believe it and do what I didn't do 21 months ago?
Wow you have huge profit and you are very lucky. If i know there's bitcoin long ago I buy because it continues to growing but I know I'm not still late so I buy btc and hold it to make a chance to have big profits like you.