We should hodl bitcoin whether the price is increasing or decreasing as long as our estimated investment time hasn't ended, holding bitcoin is the long term investment strategy and it is to way to go if an investor plan is to make profit, in fact the most obvious difference between an investor and a trader is that investors hold, traders don't.
It's important to note that some traders hold as well as investors, the difference is the duration of their holding. A trader hides for a short-term duration (0 - 3 years) while a real investor hides for a longer time(4 -10 years or more).
The longer you hold, the greater the possibility of achieving success in your investment journey, traders often regret their decisions to sell off too many or all BTC to soon as against continuous accumulation and holding for the long-term duration.