You are right because I know that I can't redeem lost money and cryptocurrency. I think every wrong transaction is a lesson we should learn, not regret.
regret will not produce anything as you say so you use regret as learning for the future so you can be more careful.
do anything that can produce good, so you can compensate your losses at that time.
hopefully with the regrets you experience, you can be more enthusiastic and more confident you can succeed.