I did not put all my money in bitcoin, because I was worried about losing all my money, especially now that bitcoin prices often go down, although many think that bitcoin will have a high price but I dare not put all my money into bitcoin.
Yes now it is a good example what will happen if we put all our money in BTC. the price is dropping and not sure where it will go and end. So always use the extra money for investment.
You can buy Bitcoin at current price if you have USD to do that.
I do not know any good time recently to buy Bitcoin at current price.
But, you should split your capital to buy Bitcoin at lower price, because $ 9,000 still higher than some predictions for the price of Bitcoin in this dump.