I made it inside a channel, so we can define better the zones. At the same time I applied 2 moving averages on OBV, to get a better idea of the trend and at same time that change direction of the trend.
Green - > uptrend - > we look for buy positions
Red - > downtrend -> we look for sell positions.
At the same time we have to be aware of crosses on , which can indicate a change in the trend .