If we see the history of Bitcoin, then it's pretty easy to see how Bitcoin recovered its price. It would take time to recover, but eventually it did. So at the end of the day, holders don't need to be regretful. I am talking about Bitcoin, not about any other altcoin. Because even though the Bitcoin price has recovered, many altcoins haven't recovered yet. Even those who bought Bitcoin at the top in the last bull run, I believe they are almost recovered. If they are still holding, they will be in profit within a couple of months. Bitcoin has given us a costly lesson that holders won't regret. We should take that lesson and keep it in mind for the future.
Long term holders will not regret and only if it is long enough. If the longevity is not more than 4 years (one bitcoin cycle), the holder has to be calculative not to enter the market at the apex of the bull run and then experience bearish market for the rest 3 years.
It is always good to buy after a specific bull run, so that you are sure that you are getting bitcoin at a discounted price. Above all, it is just bitcoin and whenever it dips, I don't get too concerned because it will definitely reverse to progress.