Of course it was best to sell at the peak)
Yes, but as one can't know whether the peak is reached, I would recommend to sell when the price kept growing and then fell down about 10%. The profit would still be significant and it would be safer this way. Analogically, I would say it is good to sell the coins when the price was falling and starts crawling back up. Yes, some profit is lost with this strategy. but risks are minimized and I think this should be our priority.