I apply this principle to hold my coins if the price is not good enough to give me profits as I don't want to sell it in a losing price then buy back at bottom. Buying at bottom is not easy due to unpredictable market. Although I believe that holding is not a solution to stop the bleeding but it will avoid to add more drop. The only proven solution to stop the drop is to increase the buy support if you have enough funds.
What if you don't have the remaining funds? holding is not the only way to solve the drop price. because one coin can continue to drop and die. and holding will be useless? the most important thing is to choose a choice that is in accordance with the real situation in the market. when prices continue to decline then sell and buy at a price below. that sounds good plan