18k would be most extreme bottom - 13k and 4.2k that's capitulation that requires some heavy life support! BTC moving off exchanges at the top is normal and sell before xmas is also normal. what isnt normal in this dump is that the volume is complete flat - i see it as re-accumulation with a possible spring towards mid to late this year. but yes, hold well and dont get shaken out. bull run end of this year.