In trading - as in life - there is a lot of space for regret, because it's inevitable - after we know the result - to blame ourselves about the decisions we took or we didn't take.
But it's completely useless: you took some decisions with the data at your disposal, and it was what you thought it was the better decision.
That's all.
All you can do is to take a better decision next time: there are still a lot of trains...
The cryptocurrency market is always volatile, so if you are not keen on seeing the market well, you can not grasp your opportunities. The times when the market fluctuates is always a good opportunity for professional investors to rapidly increase the amount of money they have so cryptocurrency is a very good market for good traders.