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.
Bitcoin, has proven to be the best and shouldn't even be compared with other coins, it has a solid foundation hence it has gain widespread adoption and has made a significant outstanding performance by increasing it's value over time since from it invention and for investors it outperforms when view on a long term perspective of over 4 to 10 years or more where you have the compounded value of your investment over time.