Why is BTC going down like it does the last days? Straight down.. Down around 10% (?)
Currently, Bitcoin's price is still $27,845, which means its fall from $30k to that price is just 7.2%, not yet up to 10%. That's just a little drop; you can see the image below of the six major Bitcoin market dumps.

Bitcoin prices always rise, with respect to economic news and others. I think Bitcoin might still drop to $25k before going up again, but I'm not sure about it.