Luckily I did not sell it when the price dropped yesterday, because I myself was convinced that bitcoin did have enormous potential. So there are no regrets who come to me, just a little sorry, why I don't know bitcoin after a month bitcoin was created.
Regret for missing good opportunities does exist, but we shouldn't be fall in remorse. There is still plenty of time for us to get the same luck with what your brother has got. Recently bitcoin is in the good trend and it could be the ideal time to buy some.
The current bitcoin trend is still good, maybe there is still a chance to get another 50% profit. But I am now buying several altcoins to welcome the altcoin season after the bitcoin season ends.