The best time to buy bitcoin is now. Traders should prefer to go long or buy instead of going short, but going short is also good if the signal really suggest bear market. But all I am thinking that would happen next month is that bitcoin would increased, get to $20000 and increase above it.
No one knows how long a bear market will last and prices change rapidly so there is still time to make a profit if you are willing to hold on.
The main trend will remain bullish, but the market needs some corrections so that everyone can collect more bitcoins. Bitcoin price could go higher and maybe next week around $21500.