According to my perspective none of the real holders of Bitcoin have lost so far. Those who get loss were not good holders. We have seen the halving of Bitcoin in the last few days and hopefully if the market situation improves we will see the new ATH in the future as well. So it doesn't matter in which price you buy bitcoin, they will not lose what I believe. Those who have not yet purchased Bitcoin this is the right time for them to purchase it and should be hold for long time.
Those who are in trading for years, might know, investing on Bitcoin for a long term would bring in lump of profits than going on a short term. Bitcoin's current price is so good to buy now than waiting for to buy when the price goes down. We are almost 70% down the market when compared to last year ATH hitting $63k. So, obviously the next pump is going to be huge and the next ATH is going to be above $63k one day or other day if not in near future. So its going to bring in huge profits when its held on a long term. Hence yes its a good advice to go for a long term.