It's not completely going to go up 100% in december even though it's down to $20k because bitcoin is still in support at $16k today it's slightly inclined to go up to $17k but it doesn't last long and it's below that again which is clear I predict still under $20k in the month ahead.
Bitcoin increased to $17000 and decreased below that it like sometimes, it also happen two days ago, but before we entered into the new month, it increaee to $17000 which may be the supoort price now. If bitcoin is still less than $20000 this month but around $18000 or $19000 is still better, even a slight increase is what would give people convenience that will lead to bull run.