Some people buy their bitcoin at price of $20000 so you are lucky that you buy bitcoin at that price because all people who buy last are now suffering in big losses. And, you are lucky to take one sweet spot in bitcoin.
People don't consider it to be luck, they strictly look at it as being a horrible event because they genuinely thought the price would break through $30,000 and probably even further, otherwise you don't buy at such levels.
Common sense would tell you to dollar cost average on the way down, but they are done with the market it seems. They are so frustrated, that they don't realize how useful it is to buy at current levels.
If you buy right now, and keep doing it below $5000 for a few more months, you significantly lower your overall buying price. Your break-even point won't be $20,000 anymore, but something far below the $10,000 mark.