Everyone hopes to get the lowest price to buy bitcoins and not to worry about the decline anymore. But the problem is if they keep waiting until the price hits bottom, they can miss buying it because we don't know when bitcoin will hit bottom. We can only keep trying to buy while hoping it is the lowest price.
Sometimes, if the market trend is down, I try to put in a price that may have a difference of up to $1k. For example, the price is now at $19k. Maybe I can place a buy order at $18k or $18,500 and let it fill itself up. But if it doesn't come down to that price, maybe I'll just leave it at that. It's not a big order anyway.