BTC bearish flag pattern

BTC is in a bearish flag pattern, this combined with the recent data of whales moving BTC to some exchanges (Whale alert) will probably drag the price to the next important support around 20k dollars per BTC. Therefore there should be a confirmation in the volume and in the movement to decide whether a short position is a good idea or it's better to wait until the price gets to 20k and start buying long positions.