just observe the bank nifty chart and you will realize how price action is built and respects trendline, in current scenario once red trendline is broken and preferably retest/ consolidate then we can see a good up move, like in abv chart happened 22-27jul after breaking black dotted trendline, then it retested on 23 n 29 aug (marked rectangular box) and again up move.. previously it did not broke up those trendline (circle marked), also BN making a channel with blue border, if BN falls n comes around 40000-40300 that would be best level as it would have EMA 20 support to jump further.