I will buy more coins if the price is falling and after that you can sell it if the price goes back into it normal price even if it will take some time to hold. But it will be worth it if the price goes up againts it normal price.
Given that you have funds then you can buy more but when you don't have any funds anymore then you can just choose to cut loss and buy back lower or you can just firmly hold and then wait for the time you will have profits. Personally though, I would choose to cut loss because that is what my trading strategy that when the price reach to point wherein that is my acceptable loss then I would just sell it and then find an opportunity to buy back lower when there is already a bullish sign.
It is correct to put stop-loss, but I bought for a long time and it does not matter that now the price has fallen.
Lucky for those who are still at a profit even when the price is already low. For those who have been in crypto market for a long time then what is happening is not new to them because they have experience it countless times and maybe bought bitcoin when it didn't reach a thousand dollars yet. But for those who bought near all time high or in December then they surely are frustrated now seeing the price keeps going down.