I'm going to say it was another great time for buying but unfortunately, I already spend my money at the time when the price of Bitcoin reach $18k. I've never expected another drop that is why I put everything on the first set of price deductions. So for now, I'm just watching the market, counting how many days we are in the correction to look for a pattern. I feel bad about myself and for the others, I could really imagine a similar situation as we have before after the 2016 bull season.
If you've already bought in at $18k and it's your last penny, it doesn't matter if your goals are long-term. hold and wait it will be better than having to panic and sell cheap.
Your mistake is just placing everything at the first discount, you have to do management so you can divide your money to make purchases at several strong supports. You need to do an analysis and determine where you should buy. You should leave the last piece for a price that never counts. so you won't run out of money to buy more if you do the right financial management.
The situation you are experiencing right now still makes sense, imagine if you bought at the ATH price and held it until now, it would make it even more stressful for you to hold it.