Plenty of factors; more regulations, more countries even banning cryptocurrency, too many alts getting out which affects Bitcoin heavily, scams and price manipulation, people willing to cash out if it reaches a certain price, after all, the point of this is to make that extra money. Once BTC reached $20k, what happened? Guys gotta cut it out
The point is to have a store of wealth that is liquid and is not backed by $20 Trillion in debt.