I believed the OP wants to know the end of this bullish runs thus giving an ample opportunity to buy massively however the present price action is quite different from that of 2017 due to massive institutional adoption of Bitcoin this year,
I wonder how much price will drop now with institutional traders in the market now. Well it is depending on how much op is waiting for the drop to be. I don't expect that price will fall like it happened after 2017 bull because the market has grown. I expect a sideways price movement and not another collapse of market. Many coins have really done fantastic aside bitcoin so market may not be going flat as in 2017.