If we we brake 616$ resistance, opening a small long position. Next targets then, are T1: 642$ and T2: 669$
If not, a possible retest of 518$ area should be considered. Possible short max. 5x with a small amount of your stack.
In general, big brother Bictoin decides future price movements. Since BTC could see a possible price dump around 15.12.2020 due to the Mt. Gox incident, you should adapt your risk management and only enter small positions.