I am very skeptical with the recent development of Bitcoin's price over the past days which I think is very unusual and in fact in your statement:
Will we see the 12-15k$ in early next month?
This is exactly what I think to have driven the price this high. In my case, I do not find this the right time to purchase BTC because it may dump anytime after they realized that the movement was too sudden. It is quiet surprising tho since not too long ago (last month) the price was around $3.7k compared to the current price (which is $9.2k in Binance as of writing this). I am just waiting for the market to calm down so I can resume trading. I don't know how to proceed trading considering how unstable it is at the moment.
It's not too difficult to answer. Most of the new coins sold on exchanges comes from miners and as we are approaching a halving which would essentially give miners half of the reward they are getting now. i.e. their profit would decrease to half if they kept selling the coins in the same price or even go into loss. It's a market response that's not new to bitcoin economy.