If in my opinion, do not ever stop to invest because when the market is rising, it's time that we sell our tokens so that the market does not come back down, but when the market goes down people stop to invest because we can lose and do not believe in the future later
Personally, I do not invest for the reason that I am afraid of losing my money because of the further price drop.
I would not like to buy a coin, for example, for 10 dollars, and in a month to see that it fell in price to 5 dollars. Therefore, I am waiting for the market to reach the bottom and start to grow slowly.