Exactly we don't need to get regretted on those things which have related to the cryptocurrency. Instead of that, we have to learn from those mistakes and never have to repeat the same mistake.
I think regret is that the most important human nature is always learning things that happen, including if you get a loss and make the loss a valuable lesson
This will apply to people who have experience in the crypto world differently from people who are just learning how to invest and this will make a big downturn for them later.