Not only Luna 2.0 but also Bitcoin, Altcoin and Total Crypto Market keeps falling now. And Luna 2.0 will fall in this market condition, but the challenge now is to survive. And since people's trust in Luna coins has diminished, Luna bleeds more than other coin in the crypto market.
It is not the same thing, you are somewhat making a mistake, you cannot compare the plunge of btc with that of Luna, or any other shitcoin/altcoin for that matter, you must take into cognizance that most altcoins including Luna are pump and dump shitcoins that only pumped in the network due to hype, and quite a lot of them die when the hype is over, they dump and do not rise again, these are the sort of coins you sell the moment you make ROI or immediately they start to crash so you do not lose your money, because if you think of hodling it for it to rise again, then you'd be making a grave mistake.
Bitcoin is different, it has an actual utility and is definitely not a pump and dump coin, the price of bitcoin can plunge for the short term, but one thing is certain, and it is that it will rise again, it is a long term coin, thus Bitcoin investors aren't really worried about its short term movement, except of course for get-rich-quick investors.