BTC supply being limited should exert a corrective influence on markets. Its not an instantaneous reaction. It takes time. Within a worst case scenario it may take months or years.
The paradigm shift from bitcoin being a long term, store of value, HODL investment vehicle towards bitcoin becoming more an instrument of speculation has altered bitcoin's price movement. The recent decline could also be seasonal in nature as transaction volume reduction occurs in the wake of the post christmas / post black friday consumer buying decline.
I know that I am missing some crucial point. Will be glad to hear you out on this one.
The proportion of buyers to sellers determines price. When there are more buyers than sellers, demand is high and the price typically goes up. When there are more sellers than buyers, as in the case of whale dumps, demand is low and the price will typically decline. Although of course there are always exceptions to both of these paradigms.