You don't say. BTC is long term not a get rich quick scheme. It's for the diamond hands not the weak ones. I'm hodling since 2013 and seen all the dips you can imagine and I still haven't sold a satoshi. For me it's the best option and will get me to fulfill my financial dreams. HODL is the way to success. But only the strong ones will benefit. For the rest there are shitcoins.
It depends, there is some situations that HODL is necessary especially that if you don't expect the price to go down so fast.
Market is volatile and risky that's why it is your choice if you will hold or sell it and accept your losses.
I'm a man with a great patience that's why I will prefer to hold as long as I can because I know that bitcoin will never disappoint us in a matter of time.