I marked on the chart two important GAP's on weekly chart which are playing important role during price movement. The blue one seems like is respected by the market since may of 2015. Every attempt to go below or above this level is met with strong resistance. The green is the one which I will be observing as this one should act as support for further gains. I would set TP just below very important psychological number which is 5000 combined with three solid gaps(marked with yellowish colour). If the blue GAP will be pierced with solid bullish candle and it will sustains gains above for some time it will be opinion very bullish signal.