I have some good reasons,
Firstly, on shorter timeframes:
Lack of buy volition above the 4.2k level, even after breakouts and new ATH's, an divergence was always there.
Large amounts of controlled sells
Limited panic selling - panic selling doesn't happen when the smart money is leaving.
Many bulls may believe that it's great we are holding above 4000 for so long, and it's a sign, I think it's the exact opposite. Bulls waiting for that blow off top may be disappointed - when smart money leaves - it leaves slowly.
Now, on large timeframes:
We have an divergence on weekly
We have almost hit the 4.236 fib from 2013 top (FYI we may break to the top here as GS predicted.)
Monthly almost at 2013 levels
Momentum curve is becoming steeper, increasing sell pressure. It is taking more and more power to keep us above the curve. At this rate, we should be at 12.5k by January 2018. That's a very long shot. Once this momentum curve is broken, in my opinion, it's the sign of a bear market.
I believe that we will remain in this zone for a while, we may have a correction here to 3k-3.5k with the fud, but in my opinion we may bounce back to the 4k level for more selloff before finally entering a bear market. Distribution periods can last a while, as larger interests will want to keep the price in this zone.
Segwit & Fud:
Yes yes I know segwit is supposed to be the best thing evar but look what happened to LTC on segwit activation. People that care about segwit already bought. We may get a pump but if it shows any weakness this only confirms distribution.
As for the fud, this makes things worse and inspire a selloff but it won't start a bear market on its own unless it literally kills BTC .
This analysis is purely technical - we are simply exhausted, everyone has already bought, everyone is waiting for the price to go higher but the last bit of blood has been drew from this stone, as can be seen by activity above 4.2k.
Long term target:
My long term target is above 2013 ATH around 1300-1500. Maybe 2000 if we are lucky (this is on a from near the beginning of the bull wave, and it may be ~2000 by he time we reach it).
It would not be strange for BITCOIN to double its value in this period, as it would also affect the economic and psychological structure of the entire planet. Just imagine for a moment the double bitcoin of value that is for 2 or 3 days, just like happened with LITCOIN.
Of course, it would return to its starting value just as it was in LITCOIN, but next would be exponential the demand for the coin and the apex never seen.
I also believe that it will touch the 3925 support line again tomorrow and then goes above 5,000
I was reading a report now that there will be an eclipse between August 21 and 22 that will tinker with the earth.