I think that this will not happen again until the spring of 2019 because now the bear market
You are assuming "bear market" Hello?
Just to let you know (just in case you don't realize it), we are currently in a BTC price correction or alternatively a "consolidation," which is not the same as "bear market."
In other words, your assertion of "bear market" remains premature.
I am not saying that "bear market" might not happen down the road, but we are not quite there yet, even though some folks like to prematurely and presumptively describe where we are at, currently, based on future assumptions of downward BTC price movement (or a very long period of sideways), neither of which has happened yet.
I also think that in this year it is not possible because there are just two and a half months to go in this year and the target is very high. There is a huge difference between the current price and $20000. Hope the next year will be good for bitcoin price. When more and more people invest their money in bitcoin and the investment cap increase the price will also increase.