2. Supply rise and Demand reduces.
Point is that the price was never really maintainable around near $20,000 levels, which was something you could have figured out even before it reached there. Anything mildly above $10,000 is a fair reflection of the market.
If the price goes up too much in such a short period of time, you'll know that if it happens to go up even further, it won't and can't be maintained for long, and that's what we are experiencing right now.
It's a clear sign that the market isn't ready to increase further for now, and honestly speaking, it shouldn't go up further. Bitcoin's current limitations don't back up a further increase, so we should be happy with where we stand now.