Deep regret was not selling anything in 2017. My life could had been completely different at the moment. It has become something that will probably be a life long regret.
Quite funny but in reality speaking your statement was true, I have also in my mind that kind of regret too, 2017 is the year of big break in the crypto industry, have time will come the bitcoin and alts glory takes its place.
99% of people will regret it for 2017 because it's a great time for this market. The entire altcoin and bitcoin has grown tremendously and if anyone could hold them they would have become rich.