My guru trader says "At this time buy in each of the existing supports, buy gradually and take profit if it's profit, don't be too "greedy", don't wait for high prices during a market like this."
I agree with your proverb. I also follow the same in the red market. I am not that much expert so I try to hold my coins when I see the coins falling. I know that in the coming future the price of these coins will recover so I am waiting for that time patiently.