Last week bitcoin try to break $4500 about three times but to no avail! I think above $4500 is possible before the end August as the momentum is very high and bitcoin Cash has rise significant for the past two day to close at $870 yesterday, I think very soon bitcoin Cash traders will start to take profit and fund will flow back to bitcoin.
Taking up to that point bitcoin cash has a effect on bitcoin some investors are migrating for a moment to take profit on that. In the other hand since bitcoin are atleast $4000 it will be not the moment to reach $4500 after a continuous price increase so i think it is better to expect on by September.