Who's it that says bitcoin has a specific period of purchasing it bitcoin? You should change that awkward thought and get your coins at when you can for bitcoin would always hold the best for you in the nearest future.
A real investor doesn't just venture into market to make investment because the market has time to enter and exit and as a trader or investors you should know all these things to enable you guide your capital otherwise you can easily lose them for just a mere market panic, just as what happened between this few days after bitcoin recording it's ATH of 73k plus ~ $74k with your ways of judgement or statement does who ventured into market at such price is on a lost right now?
Yes those people are into lost because they don't care about what the market might holds so jumping into investment without proper analysis might actually affects your investment except you have decided to hold till we achieved another new ATH other than the previous ATH.
Yes I totally agree with you that is while most investor in most market employed market analyst who can determine and monitor the system before they venture into any market it take the risk, it's very unwise by any investor to be control by mere emotion without calculating properly how the wave of the market is going, many change if plan is as a result poor analysis which subject some short time holder into Long term as they may look out means to recover there loss after venturing into the market that doesn't favour them and some may completely loss out as they can't wait or remain patient, it's good that one is not been fully control by emotion rather been influence by the proper analysis gotten towards the market.