Just follow the 4-year chart of Bitcoin, it appears that we will see a big movement this month of October. Every year this month has seen an uptrend in bitcoin price. The month has just started and soon we will be able to see that positive sign for Bitcoin. Hopefully Bitcoin will be able to reach above $25000 this month.
This month could be kind of confusing, you are right in your post though, bitcoin price has always been increasing significantly almost every October. You can see that in a previous post by Ratimov
But in this type of year at every 4 year cycle, bitcoin price did decreased in price. The first which was 2014, the decrement was high, but not that high in 2018 which may make some people to think that this year own is not really going to be volatile, or it is going to be like other Octobers with significant increase. To be sincere, I have not been this confused before about bitcoin price because indicators are suggesting otherwise, but which may be beyond this month, I mean in a way this month may be bullish or no much volatile, but followed by next months of being very bearish.