Got in at the height of Jan this year and all holdings lost more than half from the previous peak.
Very frustrated and was afraid that crypto will be zeroed out, so sold at massive loss more than 50%+ realized loss
After sold last week, all coins came back up 10-20%, even more frustrated, what to do?
This is very frustrating indeed because like you, I also invested my money at around January when the price of bitcoin is around $14k at that moment but I used it for trading. Now my money that I invested at that time is now gone but I don't feel any regret or anything right now because I can afford that money to lose.
The only thing you can do now is to move on since you have done a major mistake that makes your capital cut down into half. Just move on with it, invest again and take time to do some research. Maybe I suggest you need to buy long term coins and don't move it anywhere. Hold it for 1-2 years I think. If you are trader then you can trade some of your money so that you can gain some profit faster than holding.
Well, good for you that you could afford to lose it but the thing as well is to always play it safe, because the fact that you could afford to lose it does not mean you could not have played your card intelligently.
However, moving on or starting all over again without repeating the same mistake is all that counts. Like they always say, it is only a big fool that will keep repeating the same thing and then keep expecting to see different result. Normally, I always tell people that when what you are doing is not working out fine, then, do the opposite.