Below is the chart of Bitcoin CME futures(BTC1!).

this gap is made because the futures market is closed on weekends so if there is a high volume and big move in the weekends the market almost always comes to cover it or "fill the gap"

i am also attaching another picture showing examples of the market doing this before, for more confirmation you guys can backtest this.

Now according to this bitcoin might dump to around 64k to fill that gap.

there is also a bearish flag pattern and in this pattern the dump is expected to be the "pole" of the flag aka the previous long red candle which is about a 4% dip and if btc dips 4% more it will follow the bearish flag pattern and also successfully fill the gap.

this is what feels the most probable, but again DYOR , goodluck.