If we compare the market price movements two years ago with now there is clearly a big difference, but the fact is true as you said before there will be a decline in market prices because most people will choose to sell bitcoin to be converted into cash because there will be a Christmas celebration, and that always happen every year. but usually after that, market prices will rise a bit, and I also predict bitcoin prices will be in the range of $ 8000 until the end of this year
Year by year we cant really conclude that price and its movements would really be the same.We already see the difference and we therefore conclude that theres no such thing
on what we called "patter" there are lots of factors that do affect movement.
To the thing you had said about Christmas celebration sell-off, so far we havent seen it yet the price decrease a few weeks ago isnt really that big of a gap to consider a sell off
but rather an ordinary day of volatility.