I don't think there is a specific period for trading and this period is good as well to buy and invest. Now that Bitcoin is still wavering to go up, it is the best time to invest. OP if nothing is lost then why companies fold up and some even removed workers from the companies. There is risk in Bitcoin and with that in the process one might loss coins if care is not taking.

If anyone is buying Bitcoin now and store it for years to come even just two years and if the person buy  and store enough before 2026, the person will make enough benefits from the investment. According to the op topic the best time is now and do not procrastination again, put your dreams I'm action so that you will be smiling when the price finally rise to the peaks.