actually the most important thing is patience. it doesn't matter if you were late to sell, as long as you wait to wait someday prices will rise again. so start being patient now because bitcoin has started to rise again. and always remember to set the time and target to sell.
Agree with you, patient is the most important key in trade or holding coin. Bitcoin or crypto currency market is really too much sensitive. Only a big news can crash the market in a day. So if you thing that timing is the most important thing for bitcoin then i think it's not a smart move.