you should not be too regretful, take advantage of the existing situation, when the cheap price always try to buy coin and sell when the price is green and when it is getting the benefits and better you control your patience.
You can handle crypto regret by not repeating the mistakes you made in past. Keep looking at the market condition and start modifying your plan to stay safe. Keep the investment long term and stay optimistic by which I mean to say do not panic. You will be able to kill the crypto regret when you earn again big with your mental capabilities and market knowledge by playing the same crypto game.
I just drink untill I can't think.
(just joking)
Drinking is for a bigger problem and that is not always the solution because it is temporary. But moving on is my strategy becaus eif you keep hplding back to that thing you can never move on and my moving on means that lwarning from that mistakes because if you learn them you will avoid that to happen again. You will not commit the same mistake twice because that only means you never learn. Dont play safe take the risk and if you lose you now gain experience and know what will do the second time.