Exiting ETH at $300 thinking that was the peak, after buying in at $120.
To be fair, it was sitting at $300 for aaaaaaaages. Still, I reckon it's got a long way to go before we see ETH's peak...
Lol. No one could have even imagined last year, that Ether will even go further, but at some point anyway, the indicators started turning long and those who were smart enough as traders to see it, did and good thing it came in handy for the profit.
I have made trading decisions similar to this, but I have never regretted them, but sometimes as long as the trade is not hitting my stop loss or giving me some huge bearish signals, I really do not bother myself about it.
As long as you make money it is fine people worry too much about selling at the top of the market but it is impossible to do it all the time, the most important thing to do with your trading is to obtain consistent profits, people concentrate too much in trying to get 10 times their investment when getting 5% out of each trade can make you more money in the long run if you are a talented traders.