It's very likely that btc will break the major trend support line, then panic sale, then good X-MAS discounts on BTC/USD. But if you are not interested in 20-27% off, there is no need in buying the dip, you will have more time in 2019 to get it but at 10-15% higher prices, I don't expect exponential growth in 2019 so keep calm and start to plan your X-mas with family and friends, give this market a break :)